Welcome to Northwest Firearms
Join our community, sign up for free today!
Sign Up

AO Thompson M1SB

CountryGent

Messages
8,631
Reactions
25,323
Whilst browsing around the Auto-Ordnance site, I came upon their <broken link removed> :

4ZXy2Ak.jpg


It is basically their semi-auto M1 with a 10½" barrel. It looks pretty interesting.

Anyone have experience with these? Good, bad, or ugly?

Thanks!
 

Diamondback

Messages
7,752
Reactions
16,820
No experience, but the short barrel matches the original TSMG specs. (Note: very few receiver parts interchange between a Kahr or West Hurley semi and a GI M1 or an original 1921/27/28, largely because of the redesign required to go closed-bolt and otherwise comply with "not readily convertible to full-auto." This is why original 1927 semis are cheap: they have all the arse-pain of NFA MG since they were factory converted from full-auto 1921s and "once MG always MG," but none of the rock-n-roll fun.)

DB, Thompson nut who has owning a live Colt 1921AC on his bucketlist
 
Messages
1,777
Reactions
889
I had one about ten years ago and it was very finicky with magazines. You have to modify military surplus magazines in order for them to work in the AO Thompsons. The magazine catch/release is different. You have to dremel the hole on the surplus magazine for it to work in the AO Thompson. If you do it right, they work fine. Even the AO supplied magazines were problematic. I also had an extractor break. Once I got the magazines tuned so to speak it ran fine. It was an expensive plinker though so I sold it. Mine was an alloy frame and receiver version. Much lighter than original but the internals were the same. I had also SBR'd it as they did not offer them from the factory like they do now.
 

Diamondback

Messages
7,752
Reactions
16,820
The alternate option is to replace the mag catch with modified GI--if I had budget for a Thompson, that's the direction I'd go, in no small part because modding the mags for semi guns makes them unusable in the originals.

Dunno if he's still in business, but back in college when my Thompson geekout first started, my very first move other than taking it out for a "diagnostic" shoot would have been to ship the gun off to Paul at Diamond K and the drums off to Merle "Drum Doctor" Bitikofer for top-to-bottom tune-up.
 

LATEST REVIEWS

  • J&B Firearm Sales
    5.00 star(s)
    I've always felt comfortable at J&B, first time I ever went there I walked out with a new Glock...
    • Zapata47
  • Money Market Pawn Shop
    5.00 star(s)
    Maybe I'm biased since I live 5 minutes away, but Peter and his crew have always been friendly...
    • Zapata47
  • Oregon Rifleworks
    5.00 star(s)
    It has been a while since I have been in the store just because I don't get to downtown Tigard...
    • bobcat7677
  • Oregon Rifleworks
    5.00 star(s)
    Love all the Guys and Gals, the redbeard is pleased. Even if it wasn't 1 min away from my house...
    • SVT-ROY
  • Liberty Safes of Oregon
    5.00 star(s)
    I bugged these guys for a while as I was on the fence as to what safe to buy. There are so many...
    • trekkerpaul

Staff online