The 11-1/2 inches government profile barrel assembly is engineered for versatility in firearm builds. It incorporates a 1:7 twist rate, which is optimized for stabilizing a diverse range of bullet weights. The assembly is equipped with an F-marked front sight base and a two-piece handguard facilitating straightforward installation and operation. Constructed from premium 4150 chrome moly vanadium (CMV) steel, the barrel ensures exceptional durability and longevity. The government profile design imparts a sleek and classic aesthetic, making it suitable for both recreational and professional applications. This assembly is ideal for users seeking a traditional appearance combined with modern performance capabilities. It includes an 11-1/2 inches barrel with an F-marked front sight base, chambered in 5.56 mm and is integrated with an A3 flattop receiver. The package also comprises a bolt carrier, charging handle, forward assist and ejection-port cover.

7075-T6 aluminum forging upper component
Black upper with hardcoat anodization
Carpenter 158 steel bolt specification
Extractor bolt composed of 4140 alloy steel
Army specification heat treatment bolt
Manganese phosphate-coated bolt
Bolt carrier composed of 8620 steel
4340 alloy steel cam pin component
4130 alloy steel bolt carrier key
5.56x45mm caliber
4150 chrome moly vanadium (CMV) barrel
Barrel with 1/2-28 thread specification
Gas block journal with a diameter of 3/4 inches
Carbine length gas tube
Barrel twist rate - 1:7 right-handed
Lands and groves - section 6
M4 feed ramp extension barrel
Button engaged
Non-chrome-lined
Consist of 2-piece CAR style Handguard, 11-1/2 inches government profile barrel with F-marked/FSB 1:7 twist, A3 upper receiver assembled, fully assembled bolt carrier - 5.56x45mm carbine gas tube, F-marked front sight base, charging handle and A2 flash hider

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.