I get the feeling that as being the gun is firing, the recoil impulse is causing the gun to buckle upwards with the buffer tube pillar, pinching the bolt provider since it passes from the upper receiver in to the buffer tube. all gun mfgs have problems I have had https://semi-automatic-nerf-guns12884.jiliblog.com/91288636/h-k-sl8-1-223-precision-rifle-an-overview