Thanks for all the info!!! Great stuff really.
I did some tinkering with pmags and I found that if you dremel out the rib inside on the front it allows most rounds to fit. They have functioned well so far (10 rounders) I've been thinking of trying out one of the aa specific magazines but...
I'm super glad you did leave this up! I just recently purchased a used 57 and hadn't heard of this. My gun does fall into the serial number range but so far so good with function. I'm debating on giving them a call tomorrow to see if retrofit was done
Recently picked up a chinese sks. Nice rifle good shape, however i cant find a factory, arsenal, or import mark anywhere on this thing. Just a serial number. Its a 7 digit on the receiver and a matching 5 digit (of the last 5) on all the other parts. Doing some google research all i can really...