I think I need to clear up a couple technical issues for you...
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Quote:To clear a couple of things up; yes I'm planing on using a real M870 action that will have a four shot capacity,
This is an impossibility, because when the loading tube and barrel on a real steel (or airsoft for that matter) M870 are cut down, and when you put the spring follower and other parts back in there's only room for 2 rounds, one in the barrel, and one in the magazine tube. You cannot in any way put 4 rounds in there, unless you have access to technology that allows you to bend space/time.
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Quote: and I am also planning on remilling a Tompson reciever and barrel to use 10mm Auto which matches the bore size of the M41a and allows the shortened 20rd (45acp) magizine to hold 25rds of 10mm.
You Do realize that the real guns used were .45 caliber, correct? I mean, in the film they do say "10 mm" but reality and fantasy tend to stop mixing after the technicians get the orders to make a film prop.
Somone else here once started building a firing Pulse Rifle, but they ran into issues with getting the outside of the barrel milled so it would fit a barrel vent.
And last but not least, you're going to need authorization from the BATF to even make this kind of item. You'll be ending up with 2 class 3 short barreled weapons that will require appropriate paperwork to be made real. We have a few people here who work for gun shops that can fill you in on the necessary costs of making such a thing.
Rook
"Time has little to do with infinity and jelly doughnuts."