I have seen broken pins before but not very often. If you have broken two you have some other problem with your Uzi causing the pins to break.
Richard, the second one to break was the Group Industry gun with German lower that you reworked for me in August 2017, I broke the trunnion welds and you did a lot of work on it. Your work was fantastic, this is what I had you do:
1. Repair/re-weld the trunnion or replace the trunnion
2. Re-weld the back plate as a preventive maintenance measure.
3. Straighten the receiver as needed.
4. Install the Uzi SMG Machined Feed Ramp, included.
5. Install new ejector as a preventive maintenance measure, included.
6. Only if needed, install a new top cover latch (this may not be needed)
7. Parkerize
8. Inspect and replace any worn parts, barrel latch, nut etc.
9. Fit both two top covers for function and no lateral movement so that zero remains consistent.
10. Test and adjust for function and 100% reliability with both top covers and both barrels
The German Lower that I sent with it, looked new, I removed the Bolt Catch. You Reparkerized it to match.
It was running like a Swiss Watch until the pin broke. I replaced the sear pin, I just don't want to break another.
But the reason that I posted was to find out why his pin broke on two different guns?
I put between 5-10K a year through it. I am shooting 147 Grain 9mm,
PS, the first sear pin to break was on an early SWD pre 86 RR conversion IMI Model A, that was about a year ago.