SONS OF LIBERTY GUN WORKS M4 89

SONS OF LIBERTY GUN WORKS M4-89 300 BLKBRACE NOT INCLUDEDThe M4-89 is one of the premier fighting rifles we offer. It houses a combat grade barrel, A5 buffer system, Liberty Fighting Trigger, and B5 furniture. At Sons of Liberty Gun Works, we always tell our customers that it's not what a rifle company tells you, it's what they don't tell you. Below you will find the complete specifications of the M4-76. We have built our guns to run through years of hard use, and we have nothing to hide.Barrel: Sons of Liberty Gun Works 4150CoMOV 1:7 MPI HPT BarrelBarrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)Twist Rate: 1/7 Twist Six GrooveThread Pitch: 1/2-28 Threaded MuzzleGas Block: .750a ^2 Gas Block Journal with appropriately sized gas portBarrel Finish: QPQ Corrosion Resistant FinishBarrel Extension: QPQ coated M4 Feed Ramp ExtensionHigh Pressure (proof) Tested (HPT)Magnetic Particle Inspected (MPI)Twist Rates & Thread Pitches will match caliber. Match grade firearms will have 416 Stainless Steel barrels9 300BLK (Carbine Gas System with A2 muzzle device & Brace)785939518801