My Rail Gun
This is my design for a rail gun. It has shot two of Precision Shooting's"Official
Screamer Groups", so far. The left group was shot with a .22 Waldog
Barrel and the right group with a 6 PPC Barrel. It has won a few other
trophies, also.
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The action was made to shoot on a Rail. It is not drilled and tapped
for bases, as none are needed. The bolt handle is straight up when
open, as in a military Mauser. The bracket where the scope is mounted
is fully adjustable for wind- age and elevation. I don't have a scope
dedicated to the rail gun, but adjust the base so that a scope can
be removed from another rifle, slid onto the dovetail and be zeroed
on whichever of the two rifles the scope happens to be on. All without
adjusting the scope turret knobs. In operation, the shells are fed
into the left port and an ejector drops the fired case in the tray
as the bolt is cycled. |
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This Photo shows the construction of the bottom plate. Two ball
bearings are inlet and epoxied into the aluminum plate, as shown in
the upper left. The knob at the upper left is a 0.100" spiral
that performs the windage adjustment for the Rail base. The windage
adjustment works on a pivot principle, with the con- struction ball
at the lower right being the pivot for the base. |
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This photo shows the second plate out of position. The bushing
on the left, just in front of the coarse elevation screw is a 60
degree cone that rests on the construction ball shown earlier. The
cone and ball are the pivot. The bottom of the second plate is inletted
for two stainless stationary cylinders that rest on the two ball
bearings in the bottom plate. The center peg is the stop for the
top sliding plate that holds the barreled action. It will stop the
top plate from sliding too far back and, also, stop it when it is
returned to battery. Although, it can't be seen a Remington firing
pin spring and a plunger are inlet into the side of this plate to
push the plate against the win- dage cam. |
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This photo shows the construction of the fine elevation plate.
Two con- struction balls and a fixed 60 degree cone (behind the
windage knob) and an adjustable 60 degree cone form the pivot for
the fine elevation plate. The knob at the far left is fine elevation
for the record target. The next knob to the right is the adjustment
for the sighter target. Of course, the next knob to the right is
the windage adjustment. |
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This photo shows the base of the Rail Gun with everything in place.
The three white balls shown are the contact for the rails milled
into the bottom of the top plate. The front and left rails are a
V-shape with the right rail a flat. The small black ball on the
left of the rear plate is the sighter cam. When it is pushed forward,
the rifle is on the record target. When it is pushed to the rear,
it is on the sighter target. The photos below shows the rail gun
as it is now for 2002. I've changed the method of mounting the barrel
and action to the top plate. The barrel is completely free-floated.
The original action is epoxied into an aluminum sleeve 2.675"
in diameter x 13" long. The sleeve is then epoxied into a two
piece aluminum block which is bolted and epoxied to the top plate.
Hopefully, it will be easier to keep tuned. I know its easier to
change barrels in it without disturbing the rest of the setup. Now
its just screw one off and screw the other one on. |
| Click for a larger image |
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| Bryant Custom built rail gun for 2004.
A special thanks to Jay Young for sending me the aluminum I-beam to
build the top plate. I decided to build a new rail gun for this season
from the base up styled pretty much after a Young rail gun. This is
a little simpler design than my previous rail. The action shown is
a Stiller Diamondback with drop port. |
The below photo shows the main part bottom plate rear windage and
elevation plate. The sighter cam is made from 2" black delrin.
I made it out of delrin for speed of manufacturing and worked pretty
well so probably won't replace it. |
Shown below is the return to battery spring system similar to the
one that Jerry Hensler has used on his rail gun for the past couple
of years. It doesn't use a return to battery stop, but relies on the
spring to return it to battery. Hopefully, this will help prevent
the base from shifting on the bench top as the top plate will not
be hitting a return to battery stop. |
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