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Bullpup Marauder - Stage II

October 29 2009 at 6:03 PM
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YF

This was my backyard bullpup project from a month ago.
What I liked was the electronic trigger which was as good as any 2 stage trigger.
The stock however did not have a very good shape to the buttplate and the triggerframe was a bit bulky in the hands. And the looks, well.............

Photobucket

A makeover was in order. First I picked up a Boyd stock that had not been inletted.
The Barracuda style was ideal because of the high, continuous cheek-rest that I could channel the entire length of the stock.

Photobucket

First step was to cut a 1-1/4" channel for the air tube. I started by cutting slots into the top of the stock with a table saw. I varied the depth to approximate a half circle. Then I broke the pieces out and here is the result.

slotting the channel

I used a 1-1/4" dowel with 80 grit sandpaper glued to it to smooth out the channel. At first I chucked it to a drill press, using rollerblades as a lower support. But the bolt in the end was not plumb and the repeated flexing caused it to snap.

sanding jig

I then put it in a vice and ran the stock across it like a saw which worked very well.

smoothing the channel

The result:
smooth channel

I can't wait:
mock-up

Then comes the inletting for the triggerframe with a drillpress and carbide bit:
inleeting fro slave frame

Sitting flush:
slave frame inletted

slave frame inletted

I latter decided to use a cut up crosman triggerframe for the slave frame and use the bluefork as the master triggerframe. Here is the inletting of the frame for a microswitch:
inletting triggerframe

My 2 stage microswitch which consists of 2 switches. 1st stage to turn on the electronics, the second to trip the solenoid. That way I can do away with a slide safety switch and reduce any chances for accidental discharges due to the sensitive trigger. Instead the crossbolt safety is used to prevent the trigger from moving.
2 stage trigger switch
Inletting for the trigger frame. I had to cut the back half of the bluefork frame off to get it to fit.
inletting for the trigger

A chennel to house the electronic board and battery.
No jigs, no sliding vice, just a sharpie, a steady hand and good eye.
inletting for the electronics

It all fits!
floor plate mockup

I shaped and smoothed out the stock with various drum sanding bits and then by hand in tight places. Then went on about 10 coats of Minwax rub on-poly.
After some wiring, soldering, and reassembly.........


A closeup of the cut crosman triggerframe. I wish I could hide this somehow.
The solenoid doesn't care if it's a single or dual stage trigger. So the marauder trigger is going on my FT pistol where it won't be wasted.
bullpup marauder stage 2

The knee riser was made from some scope rings, 1" tubing and weaver bases from an ar-15. I laminated the wood to have a slight concave curve to it.
bullpup marauder stage 2

I plugged the hole above the thumbhole of the stock and relocated the gauge to the front with a T-fitting. I cut up the stock fill cap to hide the brass the best I can.
The added band holds the front of the stock to the air tube until I can come up with a better solution.
bullpup marauder stage 2

All ready for the CA state FT match next month.
With all the hardware, she weights a hefty 9.4 lbs.
bullpup marauder stage 2

Used Morgan adjustable butt-plate I picked up at a gun shop for $15
bullpup marauder stage 2

 
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