Re: decoding serial numbers
Made in California. Originally AMT was Arcadia Machine and Tool. Seems like they went out of business and were taken over at least three times (possibly more). Each new owner kept the AMT name, so you're not really sure what you have, in terms of quality.
Having said that, I have a couple of AMTs. My Hardballer frame (I just bought the frame, and built a gun on it) is A17xxx, and I bought it in '83. I've had no problems with it. My other one is a CM serial, and was bought in '99. It's not as good.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.