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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 100530 AR-Style Barrel 300 Blackout 12.50" Pistol Length Gas System 1:7" Twist 5 Grooves, 5/8&q
Proof Research 101094 Bolt Action Barrel Blank 264 Cal 28" M24 Contour 1:8" Twist 4 Grooves, Stainless Stainle
Proof Research 113714 Bolt Action Barrel Blank 243 Cal 28" Competition Contour 1:7" Twist 4 Grooves, Stainless
Proof Research 113721 Bolt Action Barrel Blank 264 Cal 28" Competition Contour 1:7.50" Twist 4 Grooves, Stainl