Ar-15 11.5'' Lightweight Gov'T Profile Upper Receiver 1-7

An 11.5-inch AR-15 upper receiver assembly built for shooters who need a compact, handy platform without sacrificing performance. This Luth-Ar AR-15 lightweight government profile upper receiver pairs a short 5.56 NATO barrel with a 1-7 twist rate—fast enough to stabilize a broad range of bullet weights from varmint loads to heavier match rounds. Whether you're building a truck gun, home-defense carbine, or short-range training setup, the 11.5" profile keeps your overall package nimble while the government contour provides proven durability and field reliability.

The upper assembly starts with a 4150 CMV barrel finished with an F-marked front sight base and government profile geometry. It threads at 1/2x28 to accept standard suppressors or muzzle devices. The barrel features M4 feed ramps and button-broach rifling—not chrome-lined, so routine cleaning matters. The A3 flattop receiver is forged from 7075-T6 aluminum with hard-coat anodize. You get the complete carrier group: a Carpenter 158 steel bolt, 8620 steel carrier with 4340 cam pin, and 4130 carrier key—all heat-treated to Army spec and finished in manganese phosphate for corrosion resistance.

This is a genuine complete upper, so once mated to a lower receiver of your choice, you have a functional AR-15 carbine. The 1-7 twist and 11.5" length make it versatile for mid-range hunting, tactical carbine courses, or suppressed shooting where velocity isn't the goal. Luth-Ar's attention to material selection and finish work shows throughout—you're getting quality steel and proper heat treatment, not budget compromises.

Key Features

• 11.5" 5.56 NATO barrel, 1-7 twist, government profile
• F-marked front sight base integrated into barrel
• Complete bolt carrier group with Carpenter 158 bolt and manganese phosphate finish
• 7075-T6 hard-coat anodized A3 flattop receiver
• 1/2x28 threaded muzzle for suppressors and muzzle devices
• M4 feed ramps and button-broached rifling
• Forward assist and ejection port cover included

Specifications

Frequently Asked Questions

What lower receiver is this upper compatible with?

This A3 flattop upper will mate to any standard AR-15 lower receiver. You'll need to source or supply your own lower to complete the rifle.

Is the barrel chrome-lined?

No, the barrel is 4150 CMV steel without chrome-lining. This means regular cleaning and maintenance are important to prevent corrosion, but many shooters prefer the accuracy potential and easier cleaning of non-lined barrels.

Does this come with a handguard?

The product listing mentions a 2-piece handguard is included, though specific attachment and material details are not provided in our specs.

What ammunition range does the 1-7 twist handle?

The 1-7 twist is a versatile rate that stabilizes a broad spectrum of 5.56 NATO loads, from lighter varmint bullets (55-62gr) through standard military rounds and up to heavier match ammunition (77gr and above). This makes it suitable for diverse shooting applications without being specialized for any single weight.