A few snags along the way to building an AR Tommy gun


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MMcfpd
July 31, 2007, 09:34 PM
This endeavor is turning into a bigger project than I'd first imagined, but, hey, I'll just enjoy it more when it's done. I hope.

In a very short while I'll have a .45 ACP AR upper that I ordered some time ago from Olympic Arms. If I could, I'd have ordered it differently, but now I've got to work with it. It's an A2 upper, so it's got a railed flattop with standard handguards and front sight, and Oly's .45 version of an A2 flash hider. This will go on a lower that Bazooka Brothers is fabricating that will take grease gun magazines.

As a nod to the Tommy gun heritage of .45 carbines, I had a walnut A2 style stock and handgrip made. They arrived today with, lo and behold, an unexpected walnut A1 style triangular handguard.

Now questions abound:

1.) I've located a triangular handguard cap. How would one install it so it stays in place? This will be a blowback semi, so there will be no gas block or gas tube.
2.) The handguard is much longer than the standard plastic ones, so I'll need to remove the front sight. Is that simply a matter of knocking out the two pins on the bottom?
3.) I'd thought about putting a Cutts compensator on the barrel as a further Thompsonesque refinement, but nobody at Kahr/Auto Ordnance will answer my emails inquiring about thread dimensions for their threaded ones, and it really seems unlikely that the threads might match those on the Oly barrel anyway - so, any suggestions for an alternative way to get a Cutts-like compensator? I tried an outfit named Kurt's Kustom with no reply there, either.

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dfariswheel
July 31, 2007, 11:50 PM
Precise Innovations will do custom builds of both muzzle brakes and adapters.

I suspect they can build either a Cutts-like brake, or make you an adapter that will adapt a genuine Cutts to your existing barrel threads.

http://preciseinnovationsllc.com/

There are any number of ways to retain the hand guard cap,
On that comes to mind is to put a collar on the barrel in front of the cap.
These collars are a split steel bushing with an Allen head screw that tightly clamps them in place.

To remove the front sight assembly, drive out the tapered pins, and then either press or carefully drive the base off the barrel using a wood block and hammer..

MMcfpd
August 1, 2007, 12:00 AM
Good info, man, thanks!

SaMx
August 1, 2007, 12:02 AM
make sure you post pics when you're done.

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