This particular BCG had only about 3k rounds on it - entirely 5.56. Noticed the bolt was moving a little to freely in the BCG on last cleaning and stood it on end. Sure enough, carrier dropped down immediately. Pulled the rings to replace (and since I planned to replace I wasn’t gentle about it). You can see one of the three looks like it has either worn excessively or partially shorn off.
Note, the rifle was cycling just fine at last use so manual inspection was the only way to discover. Inside of my BCG appears ok and now that the rings are replaced it passes the gravity test. But those functioning gas rings are there for a reason. Thought I would share because I think standard thinking is 10k rounds on the rings...
Note, the rifle was cycling just fine at last use so manual inspection was the only way to discover. Inside of my BCG appears ok and now that the rings are replaced it passes the gravity test. But those functioning gas rings are there for a reason. Thought I would share because I think standard thinking is 10k rounds on the rings...