Palmetto State Armory (PSA) M4A1

Standard M4A1 

• Caliber: 5.56 NATO
• Barrel Length: 14.5" Pin and Welded (P&W) to meet the 16" legal requirement
• Barrel Material: 4150V Chrome Moly Vanadium steel
• Barrel Finish: Nitride
• Twist Rate: 1:7
• Gas System: Carbine-length with .750 Front Sight Base (FSB)
• Receiver: Forged 7075-T6 aluminum, marked "Property U.S. Government M4A1 Carbine"
• Bolt Carrier Group (BCG): Full-auto profile, 8620 steel carrier, Carpenter 158 steel bolt
• Handguard: Drop-in Quad Rail with T-markings; includes matching rail panels and vertical foregrip
• Furniture: Classic M4-style 6-position stock and A2-style pistol grip
• Muzzle Device: Extended A2 flash hider (Pin & Welded)