Somewhere is the cobwebs of my memory I remember reading that the Czechs experienced some problems with "caps-out", so naturally the Holek brothers --being very thorough-- worked in a solution, whether it was still needed or not.

My belief is that it was more a defect in ammunition than in the gun. I had a similar mishap in a Johnson LMG with some late-'50s Germanicon .30M2 ammunition. A primer popped out and lodged firmly beneath the sear, disabling the gun! The gun had to be taken into the shop and disassembled to clear it. The primers apparently were not adequately staked.

Peter: Glad you're well. You won't recall but we met years ago at the reference library at Shrivenham.

M