Quote Originally Posted by pomyc View Post
I have a fairly new BCM 11.5 that I placed a new BCM BCG in. They have been mated together from day one.

While no malfunctions, I noticed after routine inspection after about 900 rounds, it failed the test. So, I replaced the rings. Tightened it up. However, I noticed after only about another 500 rounds, it again failed the test.

What would cause the rings to wear so quickly? Again, it shoots fine but is that indicative of anything I need to be aware of? Never had this scenario with other bolts and gas rings. Thx.
Check chrome lining inside of a carrier bore for any cracks or machining marks. If surface is not perfectly mirror it will eat gas rings just as you said every 500-1000 rounds.