Was good all year long...wife got me oe for x-mas. The ASA is a Colt clone so it can use Colt mags. ASA offers modified UZI mags that work great and are reasonably priced unlike the Colt mags. The mag block drops in from the top of the receiver so there is no modification to it needed and no tensioning pieces. VERY high quality kit. Too much fun to shoot! You'll have to use high quality ammo- no blazer or CCI. I use Winchester 115gr "whitebox" and have had only four failures to fully cycle hammer in about 230 rounds. I am using a JARD trigger (HIGHLY recommended) and my regular .223 buffer and tube, so I suspect that the buffer us the issue here. I plan to buy a new lower at the next gun show to finish a complete rifle in 9mm.
The ONLY issue I have with it is that it won't hold open on the last shot. If you use a Colt block with it and Colt mags, and a Colt extended bolt catch/release, then it will. But why spend another $175 for the block and catch and then have to spend $80+ per mag for that single feature? I may try to figure out a way to engineer a hold open with the ASA block (probably just need to cut a channel for the extended catch in it) and buy the Colt catch for $20 from J&T. Then, I will just ned to keep my eyes open for decent priced Colt mags at the shows.
Anyway, bottom line, is GET IT!