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AR-15 Carbine Low Profile Quad Picatinny Rail Gas Block
AR-15 Dual Low Profile Gas Block with Picatinny Rails Top & Bottom
AR-15 Carbine Length (9.75”) Gas Tube, Stainless Steel Precision
AR-15 M4 AR15 Micro Gas Block Steel .750 for Free Float Handguards
AR-15 Gas Block with Single Rail on Top