BT MK II problem

[DonB88]

I just bought a BT MK II. After about 60-70 rounds, the slide does not lock back after the last shot. It happens consistently with multiple magazines. Is this  a known problem? Is there something I can do to fix it? Any suggestions?

[Gunnerdad80]

Maybe inspect the slide lock/release to verify it isn’t bent or broken and moves freely. If you haven’t already, of course.