Manufacturer Part Number ANDERSONCOMPLETELOWER Item Number G06757 UPC 784672106757 BARREL LENGTH IN INCHES 0.0000 CALIBER .223 (5.56MM NATO) CHECKERING N DETACHABLE MAGAZINE Y HINGED FLOORPLATE N METAL FINISH BLACK NEWITEM YES RATE OF TWIST RECEIVER ONLY RECOIL PAD N SIGHTS N STOCK FINISH BLACK STOCK MATERIAL POLYMER SWIVEL STUDS N TYPE ACTION SEMI-AUTOMATIC WEIGHT IN POUNDS LOWER RECEIVER ONLY OTHER FEATURES: STANDARD AR-15 LOWER, INCLUDES ALL LOWER PARTS AND A 6 POSITION BUTT-STOCK, FULLY ASSEMBLED READY FOR A MIL-SPEC UPPER.