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Proof Research 100387 AR-Style Barrel 223 Wylde 11.50" Rifle Length Gas System 1:7" Twist 4 Grooves, 1/2"
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Proof Research 100462 AR-Style Barrel 223 Wylde 20" Rifle Length Gas System 1:7" Twist 4 Grooves, 1/2"-28
Proof Research 100523 AR-Style Barrel 300 Blackout 12.50" Pistol Length Gas System 1:8" Twist 5 Grooves, 5/8-2
Proof Research 113714 Bolt Action Barrel Blank 243 Cal 28" Competition Contour 1:7" Twist 4 Grooves, Stainless