I must plead guilty to not being an AK guy, but a buddy just bought one of these things and is having some serious issues. the AKT-98 is .22LR trainer for the RPK, a sweet little number and inherently very accurate. It's designed to reproduce the rifle in most respects, it just doesn't have the gas system in place (looks like it does with the gun buttoned up, but no piston, etc.). However he can't get the gun to feed if the mag has more than 3 rounds in it (out of 10 possible), and it runs away on him with most types of high or hyper velocity .22 ammo.
I have no clue about the mag issue, but I believe the problem with runaway fire rests in the lockup with the disconnector. I think it's the disconnector anyway, it's designed to catch the hammer and prevent full-auto fire while the trigger's depressed (obviously leading to a legal, semi-auto rifle). The problem seems to be that it takes too long for the bolt to push the hammer uner the disconnector, hence run-away.
It's really obvious how to MAKE the gun a full-time full-auto, I'm trying for the opposite effect: more secure lockup with the disconnector for reliable semi-auto fire. Any suggestions how I can do this? The fire control group, by the way, is theoretically the same as a standard RPK (hopefully a semi-auto version thereof in the case of this particular gun).
Any help I can get would be much appreciated.