10-12-2022, 02:22 AM
As another point of reference, my PSA Grendel upper w/ 12" SS barrel has a 0.070" gas port. I have an H2 buffer and a Superlative Arms adjustable, bleed-off capable, clamp-on gas block. It runs well at 1 turn open suppressed w/ TBAC 30 Cal Ultra 7, and 1.5 turns open unsuppressed, both with supersonic loads and conventional restrictive side of the gas block. Subsonics run well at 1.5 turns open.