AR-15 Gas Block Single Picatinny Rail .750 or .936 dia. ($39.99)
AR-15 Gas Block Single Picatinny Rail .936 inside dia. Fits Bull Barrel; .750 inside dia fits most AR15 barrels.
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AR-15 Gas Block Single Picatinny Rail .936 inside dia. Fits Bull Barrel; .750 inside dia fits most AR15 barrels.