Loading...
Loading...
Loading...
Loading...
Luth-Ar
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.
| Barrel Length | 11.5" |
| Barrel Caliber | 5.56 NATO |
| Barrel Material | 4150 CMV steel (not chrome-lined) |
| Barrel Twist | 1-7" RH |
| Muzzle Thread | 1/2x28 |
| Gas Journal Diameter | .750" |
| Gas Tube Length | Carbine |
| Rifling | 6 lands and grooves, button-broached |
| Feed Ramps | M4 |
| Front Sight Base | F-marked, integrated |
| Receiver Material | 7075-T6 aluminum forging |
| Receiver Finish | Hard-coat anodize |
| Bolt Material | Carpenter 158 steel |
| Bolt Carrier Material | 8620 steel |
| Cam Pin Material | 4340 alloy steel |
| Carrier Key Material | 4130 alloy steel |
| Finish (Bolt Carrier Group) | Manganese phosphate, Army spec heat-treated |
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.
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.
The product listing mentions a 2-piece handguard is included, though specific attachment and material details are not provided in our specs.
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.
Luth-Ar
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.
| Barrel Length | 11.5" |
| Barrel Caliber | 5.56 NATO |
| Barrel Material | 4150 CMV steel (not chrome-lined) |
| Barrel Twist | 1-7" RH |
| Muzzle Thread | 1/2x28 |
| Gas Journal Diameter | .750" |
| Gas Tube Length | Carbine |
| Rifling | 6 lands and grooves, button-broached |
| Feed Ramps | M4 |
| Front Sight Base | F-marked, integrated |
| Receiver Material | 7075-T6 aluminum forging |
| Receiver Finish | Hard-coat anodize |
| Bolt Material | Carpenter 158 steel |
| Bolt Carrier Material | 8620 steel |
| Cam Pin Material | 4340 alloy steel |
| Carrier Key Material | 4130 alloy steel |
| Finish (Bolt Carrier Group) | Manganese phosphate, Army spec heat-treated |
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.
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.
The product listing mentions a 2-piece handguard is included, though specific attachment and material details are not provided in our specs.
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.
