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I recently inherited a Thompson and I'm trying to find out about it. I checked the FAQ section here and I've looked at other resources online, but I can't find anything about a 1928 AC model. I see a 1921 AC and a 1928 A1, but no 1928 AC. In the attached photo, you can see that the "C" appears to be a different stamp than the rest of the model number, so maybe that has something to do with it. Also, I've been told there are some federal regulation restrictions on these weapons. From what I understand, if it was not registered by the early 1980s, then it is illegal to possess it now. Is this accurate? How I can check to see if it's registered without risking confiscation or other legal issues? Is there a public database with serial numbers? Thanks in advance for any and all info.

Newbie. First Post. First Thompson. I am not new to firearms and have shot since I was in grade school. I have a closet full of rifles, shotguns, pistols, etc. But like a kid that grew up with a Ferrari poster on his wall - I've always wanted this one. I purchased a new in the case 1927A1. The gun appears to be a recent factory build. Ordered an extra 30rd military clip and with information I got off of this board drifted the hole a bit higher in it so that it would fit my new gun. I also bought a 3rd party 50rd drum - but have not used it as of yet. Now every slot in the case is filled. I took "the boys" out shooting this past saturday and decided to run a few rounds through the Thompson. We took plenty of other guns and enough ammo for the four of us to shoot for two hours pretty much non-stop. The Tommy Gun ran flawlessly for everyone and a was a joy to shoot. We put 250 rounds through it without a hitch. Relying on my military training I decided to sight it in at 50 yards with a few three round shot groups. Upon firing the first three rounds directly through the bulls eye of the target my sighting it in ended. The sights are dead on - received that way from the factory. That is the first factory issued gun I have ever had arrive sighted perfectly to my eye. I like the case. I like the gun. I like the way the gun fits into the case. The local sheriff has already agreed to sign my form 1 and do the fingerprints so I can get my paperwork started to get a short (and appropriate) barrel on it. However..... I do not like the long trigger pull. From what I've read here there are about 3,372 other people that don't like it either. So I decided to do a bit of filing and polishing (as I read on here) and now the pull is perfect. It is just less than 1/4 inch before the firing pin drops - not well over 1/2 inch. And it is now very smooth and does not feel odly obstructed. Did I mention I really like this gun.......?