PROOF RESEARCH 128671 AR-STYLE BARREL 6MM ARC 18" BLACK CARBON FIBER FINISH 416R STAINLESS STEEL MATERIAL RIFLE LENGTH WITH THREADING & .750" GAS JOURNAL DIAMETER FOR AR-PLATFORM
PROOF RESEARCH 128664 AR-STYLE BARREL 6MM ARC 16" STAINLESS STEEL FINISH & MATERIAL RIFLE LENGTH WITH TREADING & .750" GAS JOURNAL DIAMETER FOR AR-PLATFORM
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PROOF RESEARCH 128671 AR-STYLE BARREL 6MM ARC 18" BLACK CARBON FIBER FINISH 416R STAINLESS STEEL MATERIAL RIFLE LENGTH WITH THREADING & .750" GAS JOURNAL DIAMETER FOR AR-PLATFORM