Quote Originally Posted by jackblack73 View Post
It seems like you're reluctant to run the H2, although I'm not sure why. It's not the dirty threads. The bolt is running too fast with the VMax. Just run the H2. I run my 11.5" BCM with standard carbine spring and H2 and it runs all ammo fine, suppressed and unsuppressed. I consider it the standard and run an H2 in all my rifles.
It may technically be possible that the threads, when clean, are allowing enough pressure loss that the weapon malfunctions then when they carbon seal. It sounds very nerdish and labbish and all, but I guess we can't 100% rule it out?