Easiest way to SBR a Thompson?

snallygaster said:

Easiest way to SBR a Thompson?

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snallygaster said:

Looks like they sell a 10.5" pistol barrel, although it looks like it's missing the front sight. Is that the easiest way to go, or would it be better to chop the current barrel and keep the compensator? I want to file my form before the end of the year and am trying to figure out OAL and such...Thanks.

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engineerbrian said:

Same boat here.

From what i've read its best to buy a barrel and have a smith install it after you get a stamp. It sounds like the barrel change out is a little tricky.

Sorry, but i haven't been keeping up. Whats the deal with the end of the year?

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snallygaster said:

Nothing per se...Just want to get things done sooner rather than later if you know what I mean. Planned to do this back in 2013 but it's still sitting in the box unfired.

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clandestine said:

You wont have a front sight is you whack a barrel.

Replacing the barrel is the easiest.

BTW, Semi Auto Thompsons DO suck. You will also need to compensate for the suppressor with heavier springs or do something like drill the bolt and add tungsten weights in the bolt.

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snallygaster said:

So, if I follow correctly, I can use the pistol barrel (finned and threaded) add the compensator with a sight (or maybe reuse my existing one?) and order/have the barrel installed once the forms come in? I didn't follow your comment about heavier springs or adding weight...I'm not looking to suppress it, just cut 6" off the barrel

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clandestine said:

Yes after the form 1 clears you can go 2 ways.

A smith could cut the sight off the 16" barrel, and sleeve it on the existing barrel once its chopped. They could then press and pin the sight on the original barrel

You can also have the barrel replaced, I guarantee its just not something many smiths have done.

Replacing the barrel is less work as long as the smith isnt a hack.

They really are crappy guns though. You would be better off with a different .45 platform.


Nevermind the springing, I thought you were going to suppress it for some reason. My bad.

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