U.S. patent application number 14/639311 was filed with the patent office on 2015-09-10 for rail device for a firearm.
The applicant listed for this patent is Darrell Holland. Invention is credited to Darrell Holland.
Application Number | 20150253104 14/639311 |
Document ID | / |
Family ID | 54017025 |
Filed Date | 2015-09-10 |
United States Patent
Application |
20150253104 |
Kind Code |
A1 |
Holland; Darrell |
September 10, 2015 |
Rail Device for a Firearm
Abstract
The present invention improves leveling of accessories mounted
on a rail on a firearm. The improved rail includes a level housing
configured at a proximal end of a Picatinny Rail. The level housing
compress a generally rectilinear body having a viewing window
configured on a front edge of the body. The body defines a volume
adapted to receive a spirit level. The volume further includes a
back wall arranged at substantially about 45-degrees incident to a
viewing plane. The housing further includes an undersized opening
on a first sidewall, which is configured to restrict the level from
escaping the volume. A second sidewall arranged substantially
parallel to the first sidewall includes an oversized opening
further configured to slideably receive the spirit level, which is
retained in place by a lock-ring.
Inventors: |
Holland; Darrell; (Powers,
OR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Holland; Darrell |
Powers |
OR |
US |
|
|
Family ID: |
54017025 |
Appl. No.: |
14/639311 |
Filed: |
March 5, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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61948751 |
Mar 6, 2014 |
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Current U.S.
Class: |
42/71.01 |
Current CPC
Class: |
F41G 1/44 20130101; F41G
11/003 20130101 |
International
Class: |
F41C 23/16 20060101
F41C023/16; F41C 27/00 20060101 F41C027/00 |
Claims
1. A rail device configured to arrange in parallel to a bore axis
of a firearm, the rail device comprising: a rail body comprising a
proximal end and an oppositely disposed distal end and a
bubble-level housing coupled to the proximal end wherein the
proximal end further comprises at least one proximal end slot and
ridge feature; the distal end further comprises at least one distal
end slot and ridge feature; the rail body further comprises a
bridge section intermediate to and linking the proximal and distal
ends; the proximal end further comprises a bubble-level housing;
the bubble-level housing further comprises a front wall, a bottom
wall, two opposing sidewalls, a back wall and a top arranged to
define an interior chamber, the interior chamber adapted to receive
a level, further the two opposing sidewall respectively further
comprise an opening configured to allow ambient into the interior
chamber, and the back wall further configures to arrange at
substantially an angle of inclination relative to a vertical axis,
the vertical axis being defined to lie in a plane that is
perpendicular to the bore axis; and the level is disposed in the
interior chamber.
2. The rail body of claim 1 wherein: the at least one proximal end
slot and ridge feature comprises a Picatinny rail slot and ridge
feature; and the at least one distal end slot and ridge feature
comprises a Picatinny rail slot and ridge feature.
3. The rail body of claim 1 wherein: the at least one proximal end
slot and ridge feature comprises a Weaver rail slot and ridge
feature; and the at least one distal end slot and ridge feature
comprises a Weaver rail slot and ridge feature.
4. The rail body of claim 1 wherein: the at least one proximal end
slot and ridge feature comprises a NATO-standard rail slot and
ridge feature; and the at least one distal end slot and ridge
feature comprises a NATO-standard rail slot and ridge feature.
5. The rail body of claim 1 wherein: the angle of inclination
relative to a vertical axis is substantially about 45-degrees.
6. The rail body of claim 1 wherein: the back wall further
comprises a machined surface so to reflect ambient light through
the bubble spirit level.
7. The rail body of claim 1 wherein: the two opposing sidewalls
further comprise a first sidewall and a second sidewall; the first
sidewall comprises an undersized opening configured to restrict the
level from escaping the interior chamber; the second sidewall
arranged substantially parallel to the first sidewall and comprises
an oversized opening further configured to slideably receive the
level, which is retained in place by a lock-ring.
8. The rail body of claim 1 wherein: the level is a bubble-spirit
level.
9. An improved rail device adapted to be arranged in parallel with
a bore axis of a firearm, the rail device comprising a proximal end
having at least one Picatinny rail slot and ridge feature, a distal
end having at least one Picatinny rail slot and ridge feature and
an intermediate linking bridge section, the improvement comprising:
a bubble-level housing disposed on the proximal end, the
bubble-level housing comprising a front wall, a bottom wall, two
opposing sidewalls, a back wall and a top arranged to define an
interior chamber, the interior chamber adapted to receive a
bubble-spirit level, further the two opposing sidewalls
respectively further comprise an opening configured to allow
ambient into the interior chamber, and the back wall further
configures to arrange at substantially about a 45-degree angle of
inclination relative to a vertical axis, the vertical axis being
defined to lie in a plane that is perpendicular to the bore axis,
the back wall further comprises a machined surface so to reflect
ambient light through the bubble spirit level; and the
bubble-spirit level is disposed in the interior chamber.
10. An improved Picatinny rail, the improvement comprising: a
housing disposed on a proximal end of the rail, the housing
comprising a front wall, a bottom wall, two opposing sidewalls, a
back wall and a top arranged to define an interior chamber, the
interior chamber adapted to receive a level, further the two
opposing sidewalls respectively further comprise an opening
configured to allow ambient into the interior chamber, and the back
wall further configures to arrange at substantially about a
45-degree angle of inclination relative to a vertical axis, the
vertical axis being defined to lie in a plane that is perpendicular
to the bore axis, the back wall further comprises a machined
surface so to reflect ambient light through the interior chamber;
and the level is disposed in the interior chamber.
11. The improved Picatinny rail of claim 10 wherein: the two
opposing sidewalls further comprise a first sidewall and a second
sidewall; the first sidewall comprises an undersized opening
configured to restrict the level from escaping the interior
chamber; the second sidewall arranged substantially parallel to the
first sidewall and comprises an oversized opening further
configured to slideably receive the level, which is retained in
place by a lock-ring.
12. The improved Picatinny rail of claim 10 wherein: the level is a
bubble-spirit level.
Description
PRIORITY CLAIM
[0001] The present application is based on, and claims priority to
for all purposes, co-pending provisional patent application No.
61/948,751 filed on 6 Mar. 2014 having the common inventor named
above.
FIELD OF THE INVENTION
[0002] This invention relates generally to hand-held firearms, and
particularly concerns both devices and methods for precisely
aligning the vertical cross hair of the reticle system of an
attached sighting scope to be parallel to a symmetry axis of the
firearm that is vertical and perpendicular to the firearm bore.
BACKGROUND
[0003] Sighting scopes, both those that magnify the sight field and
those that incorporate reticles (but do not magnify the sight
field), are traditionally mounted on their respective rifle,
pistol, or shotgun (collectively "firearm") by means of cooperating
mounting rings attached to the receiver of the firearm. The
sighting scopes include reticles, which are a system of lines,
dots, cross hairs, wires, or electrically projected images that aid
in the sighting of a target and proper positioning the firearm
relative to a target. A common reticle system is comprised of
intersecting cross hairs consisting of a vertical and horizontal
cross hair.
[0004] Often, when a scope is mounted to the firearm using the
scope-mounting rings attached to the firearm's receiver, the scope
is mounted off-center relative to the true axis defined by the bore
of the barrel and is therefore canted or rotated to some degree
resulting in misalignment of the cross hair on the scope relative
to the symmetry axis of the firearm that is vertical and
perpendicular to the firearm bore.
[0005] Shooters, especially competition target shooters, tend to
compensate for the included cross hair canting by counter-rotating
the firearm and thus compromise the accuracy of this shot.
[0006] Accordingly, it is very important that the scope's cross
hair alignment system be in precise alignment with the
corresponding axis of the firearm, which will result in a more
accurate and more repeatable shot. Further, such a system should be
easy to use, visible in low light and bright light conditions, be
economical to produce, robust and hardy in design, and simple to
mount to the weapon.
SUMMARY OF THE INVENTION
[0007] The present invention incorporates a conventional tactical
rail, also known as a Picatinny Rail (MIL-STD-913), and adapts it
to further include a unique bubble-level (float level).
[0008] The present invention adapts a conventional Picatinny rail.
First, as those skilled in the art will appreciate, a Picatinny
rail includes a curved or flat underside, configured to contour to
common rifle barrels and or receivers. And the top surface includes
a plurality of parallel ridges, the series of ridges further
include either a "V"-shaped or a "T"-shaped cross-section
interspersed with flat "spacing slots." Accessories are mounted
either by sliding them on from one end or the other and fixing the
accessory using the ridges and shoulders (the V-shape or T-shape
profile associated with the ridge). In addition to the Picatinny
rail-optimized accessory, a Weaver mount attaching scheme can be
also used. In this case the accessory (such as a scope) is clamped
to the rail with bolts, thumbscrews or levers. Alternatively,
accessories engage one or more of the slots formed between the
ridges.
[0009] The present invention incorporates a conventional Picatinny
rail, which includes a slot width spacing of substantially about
0.206-inches (5.23 mm). The spacing of slot centers is 0.394 in
(10.01 mm) and the slot depth is 0.118 in (3.00 mm). Between each
slot, a ridge stands proud and the actual width of the ridge may
vary. In addition to the features found in a conventional Picatinny
rail, the present invention includes, at a proximal end, a housing
configured to receive a spirit-type "bubble" level. This housing is
fabricated from the same, continuous piece of raw stock aluminum
block, and both the housing and conventional Picatinny rail
features (at the distal end) are machined during fabrication.
[0010] The housing is configured to receive and encapsulate a
unique spirit level (also called a bubble level or simply a level),
which is an instrument designed to indicate whether a surface is
horizontal (level) or vertical (plumb). In this application the
level is oriented to determine horizontal leveling of the accessory
attached to the rail.
[0011] The level consists of a slightly curved glass tube that is
incompletely filled with a liquid such as a colored spirit or
alcohol, leaving a bubble in the tube. At slight inclinations the
bubble travels away from the center position, which is usually
marked.
[0012] Alcohols such as ethanol are often used rather than water.
Alcohols have low viscosity and surface tension, which allows the
bubble to travel the tube quickly and settle accurately with
minimal interference with the glass surface. Alcohols also have a
much wider liquid temperature range, and won't break the vial as
water could due to ice expansion. A colorant such as fluorescein,
typically yellow or green, may be added to increase the visibility
of the bubble.
[0013] To further aid in light reflectivity of the level, the
housing includes open ends on the front and back. Further, a
polished machined surface inclined substantially about 45-degrees
relative to the viewing window serves as a back wall behind the
vial. This concentrates and reflects more light toward the user,
making the present invention highly readable even in low-light
conditions.
[0014] The present invention would work equally well by similarly
adapting a Weaver rail, NATO-standard rail, or one-piece rail mount
with a dove-tail, or holes with screw or other fastener mount or
side clamps to hold rings. The primary difference between the
Picatinny rail and a Weaver rail is the size of the slots: Weaver
rails have a slot width of 0.180 in (4.57 mm), but are not
necessarily consistent in the spacing of slot centers.
[0015] One contemplated embodiment of the present invention
includes an improved leveling device for rifle accessories
utilizing a Picatinny Rail the improved leveling device comprises a
level housing configured in a proximal end of the Picatinny Rail,
the level housing comprising a generally rectilinear body having a
viewing window configured on a front edge of the body, the body
defining a volume adapted to receive a spirit level, the volume
further including a back wall arranged at substantially about
45-degrees incident to a viewing plane;
[0016] The level housing further comprising an undersized opening
on a first sidewall, the undersized opening configured to restrict
the spirit level from escaping the volume adapted to receive the
spirit level and an oversized opening on a second sidewall, the
second sidewall configured substantially parallel to the first
sidewall and wherein the first and second sidewall are
substantially perpendicular to the viewing window, the oversized
opening further configured to slideably receive the spirit level;
and
[0017] A lock-ring is configured to engage the oversized opening
whereby the spirit level is restricted from escaping the
volume.
[0018] In another contemplated embodiment, the present invention
contemplates a device for a rifle, the device comprising:
[0019] a Picatinny or Weaver rail or one-piece rail with a dovetail
cross slot comprising a plurality of mounting holes and a plurality
of interspaced ridges and slots, the rail having a proximal end
consisting of a level housing;
[0020] The level housing comprising a generally rectilinear body
having a viewing window configured on a front edge of the body, the
body defining a volume adapted to receive a spirit level, the
volume further including a back wall arranged at substantially
about 45-degrees incident to a viewing plane;
[0021] The level housing further comprising an undersized opening
on a first sidewall, the undersized opening configured to restrict
the spirit level from escaping the volume adapted to receive the
spirit level and an oversized opening on a second sidewall, the
second sidewall configured substantially parallel to the first
sidewall and wherein the first and second sidewall are
substantially perpendicular to the viewing window, the oversized
opening further configured to slideably receive the spirit level;
and
[0022] A lock-ring is configured to engage the oversized opening
whereby the spirit level is restricted from escaping the
volume.
DRAWING
[0023] FIG. 1 is a top view of a preferred embodiment of the
present invention.
[0024] FIG. 2 is a side view of the embodiment of FIG. 1.
[0025] FIG. 3 is a cross-sectional view along the line 3-3 of FIG.
1.
[0026] FIG. 4 is a cross-sectional view along the line 4-4 of FIG.
1.
[0027] FIG. 5 is an offset frontal view of the embodiment of FIG.
1.
[0028] FIG. 6 is a partial front view detailing the level housing
on a modified Picatinny Rail according to a preferred embodiment of
the present invention.
[0029] FIG. 7 is a partial side view of the level housing of FIG.
6.
[0030] FIG. 8 is side view of the rail device of FIG. 1 and depicts
system using the rail device.
[0031] FIG. 9 is a cross-sectional side view of the level housing
portion of the rail device of FIG. 1 along the line 9-9 of FIG.
6.
[0032] FIG. 10 is a representational view illustrating a preferred
angle of the back wall of the level housing of FIG. 9.
DESCRIPTION OF THE INVENTION
[0033] Possible embodiments will now be described with reference to
the drawings and those skilled in the art will understand that
alternative configurations and combinations of components may be
substituted without subtracting from the invention. Also, in some
figures certain components are omitted to more clearly illustrate
the invention.
[0034] Although the present invention is discussed relative to a
Picatinny rail, those skilled in the art will appreciate that the
design, spirit, and scope of the invention can readily be adapted
to other mounting systems, and this discussion, accordingly, should
not be limiting. A Picatinny rail is also known as a MIL-STD-1913
rail and is a bracket that provides a standard mounting platform
for accessories and attachments. Similarly, a Weaver rail mount,
which uses a pair of parallel rails and several slots perpendicular
to these rails, is partly compatible with the Picatinny rail--and
accordingly, the teachings of the present invention are readily
adaptable to a Weaver rail including older Weaver systems that use
two pieces mounted a distance apart from one another, typically on
the receiver of a rifle over the bolt opening where the cartridge
would be inserted and/or ejected. And, the present invention can be
readily adapted to a NATO Accessory Rail (NAR), which is backwards
compatible with the Picatinny rail.
[0035] Some limitations of rail mounting systems that are overcome
by using the present invention with a Picatinny rail can be
overcome without detracting from the spirit and scope of the
present invention. For example, the slots on a Weaver rail system
have a slot width of 0.180 in (4.57 mm), but are not necessarily
consistent in the spacing of slot centers.
[0036] The improved rail device 10 of the present invention greatly
improves over the state of the art and eliminates problems
associated with conventional scope mounting. The improved rail
device provides windage and elevation calibration allowing a
shooter to optically center the reticle for maximum performance
from a mounted riflescope S (in FIG. 8, for example). As FIG. 8
shows, in one preferred embodiment the improved rail device 10
includes two Leupold Mark 4 rings (R1 and R2) to compliment the
rail mount. Additionally, the improved rail device includes a 20
MOA forward slope, which enables the improved rail device to be
machined and combined with a sine bar to allow for a neutral to 25
MOA forward slope quickly and easily, and shims, (not shown) if
required, are understood to be included in this system.
[0037] FIGS. 1-10 illustrate a first preferred embodiment of the
present invention. The present invention comprises an improved rail
device 10 for improved alignment of accessories mounted to a
firearm, such as a rifle. The improved rail device is suitably
configured to enable perfect alignment for a scope or other
accessory for a firearm. The improved rail device includes a
plurality of rail mounting features as would be understood in
conventional rail mounting devices, such as a Weaver rail or
Picatinny rail, or NATO rail and includes a rail body 12 having a
proximal end 13 and a distal end 15, the proximal end includes a
leveling device. By proximal end 13, I mean that end which faces
the shooter when targeting a scope mounted on a rifle, for
example.
[0038] In one preferred embodiment, the present invention includes
many of the features of a conventional Picatinny rail. And,
accordingly, the present invention includes a slot width spacing of
substantially about 0.206-inches (5.23 mm). The spacing of slot
centers is 0.394 in (10.01 mm) and the slot depth is 0.118 in (3.00
mm). A first plurality of slots arranges at the proximal end of the
body of the present invention, a second plurality of slots arranges
at the 13 distal end of the body of the present invention and an
intermediate bridge portion 17 arranges intermediate to the
proximal 13 and distal 15 ends.
[0039] The leveling device includes a level-housing 30 configured
at the proximal end 13 of the rail body 12. The level housing
includes a reflective illumination feature the produces the
brightest scope level using ambient light. The level housing
further includes a canted direction that enable a shooter to use
the level bubble from a shooting position.
[0040] An improved rail mounting system comprises an improved rail
device, one or more self-leveling rings, and a conventional scope.
The present invention contemplates an improved rail device
comprising a rail body 12 comprising a proximal end 13 and an
oppositely disposed distal end 15 with an intermediate bridge 17
spanning between the proximal and distal ends. Each respective
proximal and distal end comprising a plurality of slots 14 and
ridges 16 predictably spaced along a top surface 22 of the rail
body, ideally having the characteristics of a Picatinny rail,
however, alternative contemplated embodiments adopt other
conventional rail arrangements including Weaver or NATO standard
rails, for example.
[0041] The proximal end further comprising a level housing, the
level housing comprising a front wall 37, a bottom wall, two
opposing sidewalls 34 and 39, and a rounded top and a window 32
arranges whereby so that a level bubble 50 can be viewed at many
useful angles when mounted on a rifle, and a back wall comprising a
highly polished surface arranged at substantially about 45-degrees
from a vertical plane established by the front wall of the
level-housing;
[0042] As will be well appreciated by those skilled in the art, the
rail 12 includes a plurality of slots 14 and ridges 16 predictably
spaced along the top surface 22 of the rail. Conventional mounting
holes 18 are also dispersed, as would be expected. Although this
invention discusses a Picatinny Rail, other similar mounting aids
could be readily modified to include the improvement of the present
invention. The ridges 16, perhaps best illustrated in FIG. 3, which
is a cross section of the rail 12 at line 3-3 in FIG. 1, have a
substantially flat top surface and opposing shoulders to which an
accessory may be configured to attach.
[0043] Making specific reference to FIGS. 1, 2, and 5, the
level-housing 30 arranges on the proximal end 13 of the rail 12.
The level-housing 30 includes a front wall 37, a bottom wall, two
opposing sidewalls 34 and 39, and a rounded top. A window 32
arranges so that a level 50 can be viewed at many useful angles
when mounted on a rifle.
[0044] FIGS. 5-9 further detail the level-housing 30. A first
sidewall 29 includes an undersized opening 38 that is sized so that
a level 50 cannot escape the opening. However, the opening should
be sufficiently large to let as much ambient light into the
housing's chamber. The opposite, or second, sidewall 34 includes an
oversized opening 36, which configures to allow the spirit level 50
slide into the chamber encapsulated by the level housing. A
retainer clip 60 configures to secure the level 50 inside the
chamber.
[0045] Importantly, the chamber includes a back wall 35 that is
angled substantially about 45-degrees relative to a vertical plane
established by the front wall of the level housing. This back wall
should be machine polished to be highly reflective, whereas the
rest of the device 10 may be painted a flat black or other color as
dictated by its use.
[0046] With specific reference to FIGS. 6, 9, and 10, a level
housing--in one particular preferred embodiment includes a window
32, which is shown in the cross-sectional profile view of FIG. 9.
This window enables a shooter to clearly view the spirit level
bubble from shooting position (The spirit level is not depicted in
FIGS. 9 and 10). The angle of this back wall 35 is important and is
substantially about 45-degrees relative to a constructed vertical
reference line and from a constructed horizontal reference line,
which will be further explained in relation to FIG. 10, below. As
FIG. 9 illustrates, the back wall 35 arranges at an acute angle
relative to a constructed vertical. The angle of inclination of the
back wall 35 is depicted as the constructed line marked A-A in FIG.
9. A parallel line P1-P1 is constructed offset from this back wall
angle inclination reference line A-A as a matter of convenience. A
horizontal line OBA-OBA is parallel to, but offset from the bore
axis of the firearm; this reference axis is also parallel to the
long axis of the rail device 10. A vertical line V-V is
perpendicular to this offset bore axis OBA. With reference to FIG.
10, the aforementioned constructed lines are duplicated with the
components of the level housing omitted from this view. From this
the acute angle of inclination "a" is shown relative to the
vertical axis V-V. In one preferred embodiment the angle of
inclination "a" (reflecting the orientation of the back wall 35) is
substantially about 45-degrees: However, those skilled in the art
will understand that this angle could range from substantially
about 5-degrees to substantially about 85-degrees, depending on
many factors.
[0047] The two side openings 36 and 38, cooperating with the
window, and highly polished back wall 35 result in a highly visible
level even in low light conditions.
[0048] The level 50 is a conventional bubble level or spirit level
that has a bubble 52 and centering lines 54 and works as would be
conventionally understood by those skilled in the art. The level 50
is arranged horizontally to establish that the accessory mounted to
the rail is level.
[0049] The device 10 is machined from a block of aluminum or steel,
stainless steel, carbon fiber, brass or other metals, alloys, or
plastics, as would be understood in this art.
[0050] One method of configuring a rifle having a receiver with the
improved rail device of the present invention includes the
following steps:
[0051] Providing an improved rail device comprising a proximal end
with at least one slot and ridge and a distal end with at least one
slot and ridge, the proximal end further including a level housing
comprising a spirit level, a viewing window configured to enable a
shooter to view the spirit level from a shooting position, and the
spirit level having a back wall that is arranged at an inclined
angle substantially about 45-degrees from a vertical reference line
that is perpendicular to the bore axis of the firearm and wherein
the rail device includes a proximal base element and a distal base
element;
[0052] Attaching the proximal base element to the proximal end of
the receiver;
[0053] Attaching the distal base element to the distal end of the
receiver;
[0054] Verifying that the top of the distal base element when
mounted to the receiver and the top of the proximal base element
when mounted to the receiver lie in the same horizontal plane;
[0055] If the tops of the distal base element and proximal base
element are not coplanar, shimming one of the base elements to
bring both tops into a common plane; (providing one or more shims
to enable this);
[0056] Attaching the improved rail device to the respective
proximal base element and distal respective element using screws
provided including at least one 10-32 flat head cap screw and at
least one 10-32 button head screw;
[0057] Providing one or more rings configured to selectively couple
to at least one rail on the improved rail device;
[0058] Using a vise, leveling the rifle and base in the vise and
hang a plumb obo from a ceiling across the room from the rifle
mounted in the vise;
[0059] Placing the scope in the ring halves, snugging the ring caps
after aligning the reticle to the string line;
[0060] Providing a collimator and inserting the collimator into the
bore and aligning the collimator with the scope reticle;
[0061] Turning the windage dial (left or right) until the reticle
stops moving in the collimator;
[0062] Counting the number of clicks or MOA as the windage knob is
turned in the opposite direction and taking the number of clicks or
MOA and dividing by 2, thus centering the windage adjustment in the
erector tube; repeat this for the elevation adjustment;
[0063] With the reticle centered in the scope, removing the scope
from the rail and snugging the 10-32 pivot screw on the proximal
base element and snugging the 10-32 button head screw on the distal
base element;
[0064] Re-attaching the scope and reading the collimator/reticle
alignment; shifting or taping the base left or right to align it
with the collimator for windage; and tightening the button head
screw;
[0065] Using a transfer punch, lightly center punching the location
of the front (distal) locking screw in the distal (front) base
element; removing the distal base element from the receiver and
placing it in a mill vise;
[0066] Locating the center punch mark and center drilling, complete
drilling with a #22 drill and tapping a 10-32 tap;
[0067] Cleaning both base elements and refinish if necessary;
[0068] Cleaning the 6-48 tapped holes in the receiver with Acetone
and cleaning the 6048 screw;
[0069] Using blue or purple grade of Loctite, applying a small drop
to each of the base element base screws; and attaching the
respective bases to the receiver and tightening the respective
bases to the receiver; and
[0070] Zeroing the rifle conventionally at a range.
[0071] Although the invention has been particularly shown and
described with reference to certain embodiments, it will be
understood by those skilled in the art that various changes in form
and detail may be made without departing from the spirit and scope
of the invention.
* * * * *