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Proof Research 100042 AR-Style Barrel 6.5 Creedmoor 20" Rifle +2 Length Gas System 1:8" Twist 4 Grooves, 5/8-2
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Proof Research 100059 AR-Style Barrel 6.5 Creedmoor 24" Rifle +2 Length Gas System 1:8" Twist 4 Grooves, 5/8-2
Proof Research 100448 AR-Style Barrel 223 Wylde 18" Rifle Length Gas System 1:8" Twist 4 Grooves, 1/2-28 tpi,
Proof Research 100561 AR-Style Barrel 300 Blackout 16" Carbine Length Gas System 1:8" Twist 5 Grooves, 5/8-24
Proof Research 101681 AR-Style Barrel 223 Wylde 20" Rifle Length Gas System 1:8" Twist 4 Grooves, 1/2-28 tpi,
Proof Research 121665 AR-Style Barrel 6.5 Grendel 18" Rifle Length Gas System 1:8" Twist 4 Grooves, 5/8-24 tpi