Thanks for the comments. AMT is out of business (unfortunately). The only advantage to that is that parts are relative inexpensive right now. Many parts are still available from parts houses, including complete 9mm tops and 357sig barrels(Numrich, etc.) I had heard a lot of stories about reliability on the AMT. I found that the design is very simple robust and sound. The problem seems to be mostly little things easily taken care of. After polishing the feed ramp and adjusting the feed lips on new factory original mags, the little AMT Backup is 100% reliable with the 40s&w in all rounds tested except ARSCORP stuff from the Philipines. After 3 or 4 hammer strikes this ARMSCORP stuff will still not fire, so I think it is definitely hard primers and not a gun issue. I think a majority of reliability issues were mag related and are easily fixed. The factory just did not take time to adjust the mag lips properly as nearly every factory mag I bought was a jammo-matic until it was adjusted. I have not had the other tops long enough to test them yet, other than just preliminary fit and function, and I don't even have mags for the 45 yet. This package gives a real versatile package for major calibers in an extremely small package that can be carried as a primary weapon or switched to a true backup roll behind a full size gun in any one of the calibers mentioned. I could also shoot 38super, but I cannot find a top and it offers nothing over the calibers I already have. I am in the market for a 400 Corbon barrel. I just missed one on ebay a couple months ago.
I am really interested in the EAA. I was not aware that their top half would interchange. Thanks. I have a jones for interchangeable barrel guns (Contender, Dan Wesson, AMT, Mossberg 500 and S&W 22s)
Roll Tide