With the unfortunate news of Anderson Manufacuring closing its doors, we will not be able to warranty or exchange any items directly through them. These items are not returnable. Anderson AM15 CALIFORNIA LEGAL AR-15 - 5.56CALIFORNIA LEGAL!Caliber: 5.56 NATOCapacity: 10rdBarrel: 16a ^2 (1:7) Government with KAK CompensatorUpper Receiver: Forged Aluminum, BlackLower Receiver: Forged Aluminum, BlackStock: Synthetic 6-Position Fixed StockGrip: A2 Pistol GripHandguard: M-LOK Free FloatWeight: 6.2 lbs.Anderson Compmag AR-15 is chambered in .223/5.56 comes with a 16" Chrome Moly Vanadium Steel Government contour barrel 1-7 twist , Forged Receivers, M-LOK Free Float Handguard, 6-position butt stock, A2 pistol grip, KAK Compensator, and a standard charging handle. All receivers, charging handles and buffer tubes are 7075 T6 Aluminum.