JP Enterprises Enhanced One-Piece Gas Ring - .308

LBE Unlimited AR BOLT GAS RINGS (SET OF 3)

Sprinco USA 9-Pack Bolt/Gas Ring

JP Enterprises 12-Pack JPSCS2/VMOS Replacement O-ring w/Spacer Shim 9mm, Black

CMMG 3-Pack Split Type Gas Ring

Superlative Arms Solid Set Screw Direct Impingement Adjustable Gas Block 0.875" x 1", Gray

Sprinco USA Lucky 13 13-Pack Mil-Spec Extractor Insert and Mil-Spec Viton O-ring

Superlative Arms Solid Set Screw Direct Impingement Adjustable Gas Block 0.936" x 1", Black