A height challenged friend of mine bought himself a Thompson Sub Machine Gun(set for only semi operation) and could not reach the trigger comfortably with the gun held to his shoulder. He asked me if I could shorten the stock for him. Of course I can never say no to odd projects and I said "sure I'll give it a shot. Here are some pics of the process and the results.
Note that he did not want to modify the original stock so he had ordered a replacement off the web and a complete set of associated hardware, a butt plate, screws etc. He wanted 1.5 inches removed but we noticed that the new stock was already 3/8" shorter so we settled on shortening it by 1 inch. Both stocks are very nicely figured Walnut.
I mounted the stock to a sled like setup. A couple pieces of scrap ply glued and nail at a 90* angle. This kept the stock mounting area orientated properly to the band-saw blade and sander drum. The second pic shows the 1" scribe line and the 3rd shows the marked section sawed off.
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The stock flared somewhat away from the butt plate requiring re-tapering to the butt plate outline.
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This shows a comparison of the new stock to the original.
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The stock did not fit the gun when received, the slot that mated with the lower part of the gun receiver was about 0.010" to 0.015" too narrow and we were afraid we might split the stock if we forced it so I shaved the sides of the slot slightly with my table saw blade, again building a sled like jig to hold the stock in the proper orientation for shaving the sides.
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Continued in next post.