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Proof Research 101292 Carbon Fiber AR-Type 308 Winchester 20" Barrel with Rifle Gas System
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Proof Research 100028 AR-Style Barrel 308 Win 18" Rifle Length Gas System 1:10" Twist 5 Grooves, 5/8-24 tpi, C
Proof Research 100998 Bolt Action Barrel Blank 308 Cal 22" Sendero Contour 1:10" Twist 5 Grooves, Carbon Fiber
Proof Research 101261 AR-Style Barrel 308 Win 16" Intermediate Length Gas System 1:10" Twist 5 Grooves, 5/8-24