[43m1garand]

This is the breach block we use at work.
View attachment 337619

Is the yellow part metal or plastic? Chamber flags, as Bret mentioned, are plastic. I suppose someone could have made some chamber flags out of metal (steel or aluminum).

 

[43m1garand]

The manufacturer calls it an empty chamber indicator. Hopefully you can figure out the problem with the brass.

Safe Tech

Safe Tech makes the Saf-T-Round; an ejectable gun safety device that prevents accidental discharge of weapons. The gun chamber flag is a high quality reusable empty chamber indicator that shows the gun chamber does not have live ammunition.

www.safrgun.com