11.5" 5.56 NATO Carbine A2 Carry Handle Upper Receiver Group

11.5” 5.56 Carbine Chrome Phosphate Barrel

The barrel features a heavier continuous profile that strategically concentrates material near the chamber while reducing unnecessary weight toward the muzzle. This increases rigidity and heat capacity where they're most beneficial, helping maintain accuracy during sustained fire while improving overall balance.

• 5.56 NATO
• Carbine Gas System
• 4150 CrMoV
• 1/7 Twist
• 1/2x28
• .750 Gas Block Journal, Dimpled
• Gas Port Tuned For Supressed or Un-Supressed with Brass Ammunition
• Phosphate & Chrome Lined
• 25.9oz

Super Duty - 5.56 Bolt Carrier Group

To improve gas efficiency, each gas key is hand flattened to true the surface. Furthermore, each carrier has a gasket hand applied between the gas key and the carrier. Gas key is torqued to spec using OCKS (Optimized Carrier Key Screw) and properly staked.

• Full-Auto M16 profile Carrier: 8620 Steel Manganese Phosphate Finish/Hard Chrome Lined For Corrosion Resistance
• Bolt: 158 Carpenter Steel, Shot peened, Individually high pressure/proof tested and individually magnetic particle inspected 
• Extractor: 4340 with Sprinco 5-Coil Heavy Duty Extractor Spring
• Ejector: S7 with Sprinco Enhanced Ejector Spring
• Gas Key: 4130 Hand Flattened To True The Surface With OCKS(Optimized Carrier Key Screw)
• Cam Pin: 4340 Forward Marked For Consistent Orientation To Reduce Wear And Improve Life Of Bolt
• Firing Pin: 8640 Steel With Hard Chrome Plating

Centurion Arms C4 M-LOK Handguard

• 6061 T6
• Type 3 Hard Coat Anodized
• Continuous MIL-STD 1913 Picatinny Top Rail
• Four Integral Anti-Rotation QD Sling Sockets
• M-LOK slots at 3, 6 and 9 o'clock
• 7.7 oz

Centurion Arms C4 Quad Handguard

• 6061 T6
• Type 3 Hard Coat Anodized
• Continuous MIL-STD 1913 Spec Rail at 12, 3, 6 and 9 o'clock
• Four Integral Anti-Rotation QD Sling Sockets
• 10.5 oz

A2 Forged Upper

• Forge Mark From US Forges
• 7075-T6 Type 3 Hard Coat Anodized
• M4 Feedramp

Feed Ramp Polish

• Smooth, polished feed ramps can aid in more consistent and reliable feeding
• Removes minor machining marks and surface imperfections
• Maintains original feed ramp geometry
• Improves overall fit and finish

Upper Receiver Face Truing

• Precision-machined receiver face
• Flat, square mating surface for the barrel extension
• Maximizes barrel extension contact
• Reduces the potential for assembly-induced stress
• Promotes optimal barrel alignment

100% Made in USA

It is the buyer's responsibility to ensure full compliance with all applicable NFA regulations and other federal, state, and local laws.