Colt AR-15 Pistol Upper Receiver Assembly - 5.56x45mm, 14.5" Barrel, No HandguardColt$796.86
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Luth-Ar
The Luth-AR 14.5" SOCOM upper receiver brings serious performance to your AR-15 build with a combat-proven profile and precision engineering. Built around a 5.56mm 4150 CMV steel barrel with a 1-7" twist rate, this upper delivers reliable accuracy and velocity in a compact package favored by tactical shooters and those running shorter sight lines. The M4 SOCOM profile—paired with the included F-marked front sight base—gives you classic AR ergonomics with modern versatility.
This complete upper comes assembled and ready to drop onto your lower receiver. You're getting Luth-AR's attention to materials throughout: a 7075-T6 aluminum receiver hard-coat anodized for durability, a Carpenter 158 steel bolt with 4140 alloy steel extractor, and an 8620 steel carrier with 4340 cam pin, all heat-treated and finished to Army spec. The barrel features 6 lands and grooves with M4 feed ramps and a button-broached bore (not chrome-lined) threaded for standard 1/2 x 28 muzzle devices. Carbine-length gas system keeps everything compact without sacrificing reliability.
Whether you're setting up a recce rifle, a designated marksman platform, or just want a proven SOCOM upper for your collection, this Luth-AR assembly takes the guesswork out of parts compatibility and quality control. No need to source and match individual components—it's been done for you by a builder who knows what works in the field.
| Barrel Length | 14.5" |
| Caliber | 5.56mm |
| Barrel Profile | M4 SOCOM |
| Barrel Twist | 1-7" RH |
| Barrel Material | 4150 CMV steel (not chrome-lined) |
| Muzzle Thread | 1/2 x 28 |
| Gas System | Carbine |
| Gas Block Journal | .750" diameter |
| Rifling | 6 lands and grooves |
| Feed Ramps | M4, button-broached |
| Receiver | 7075-T6 aluminum, A3 flattop, hard-coat anodized |
| Bolt Material | Carpenter 158 steel |
| Extractor Material | 4140 alloy steel |
| Bolt Carrier Material | 8620 steel |
| Cam Pin Material | 4340 alloy steel |
| Carrier Key Material | 4130 alloy steel |
| Front Sight Base | F-marked |
| Included Components | Bolt carrier, charging handle, forward assist, ejection port cover |
This is a standard AR-15 upper receiver and will fit any mil-spec AR-15 lower. The A3 flattop design is compatible with picatinny-rail mounted optics and iron sights.
No. The 4150 CMV steel barrel is not chrome-lined, which is typical of the SOCOM profile. The unlined bore can offer some accuracy advantages and accepts standard AR maintenance practices.
The 1-7" twist is a versatile rate that stabilizes a wide range of 5.56mm loads. It will handle standard 55-grain ball ammunition, heavier match-grade rounds, and most everything in between. For specific bullet compatibility, consult ballistic stability calculators with your exact ammunition.
The gas block journal is .750" diameter, standard for AR-15 builds. Any quality gas block designed for that size can be pinned or clamped per your preference and local regulations.
Luth-Ar
The Luth-AR 14.5" SOCOM upper receiver brings serious performance to your AR-15 build with a combat-proven profile and precision engineering. Built around a 5.56mm 4150 CMV steel barrel with a 1-7" twist rate, this upper delivers reliable accuracy and velocity in a compact package favored by tactical shooters and those running shorter sight lines. The M4 SOCOM profile—paired with the included F-marked front sight base—gives you classic AR ergonomics with modern versatility.
This complete upper comes assembled and ready to drop onto your lower receiver. You're getting Luth-AR's attention to materials throughout: a 7075-T6 aluminum receiver hard-coat anodized for durability, a Carpenter 158 steel bolt with 4140 alloy steel extractor, and an 8620 steel carrier with 4340 cam pin, all heat-treated and finished to Army spec. The barrel features 6 lands and grooves with M4 feed ramps and a button-broached bore (not chrome-lined) threaded for standard 1/2 x 28 muzzle devices. Carbine-length gas system keeps everything compact without sacrificing reliability.
Whether you're setting up a recce rifle, a designated marksman platform, or just want a proven SOCOM upper for your collection, this Luth-AR assembly takes the guesswork out of parts compatibility and quality control. No need to source and match individual components—it's been done for you by a builder who knows what works in the field.
| Barrel Length | 14.5" |
| Caliber | 5.56mm |
| Barrel Profile | M4 SOCOM |
| Barrel Twist | 1-7" RH |
| Barrel Material | 4150 CMV steel (not chrome-lined) |
| Muzzle Thread | 1/2 x 28 |
| Gas System | Carbine |
| Gas Block Journal | .750" diameter |
| Rifling | 6 lands and grooves |
| Feed Ramps | M4, button-broached |
| Receiver | 7075-T6 aluminum, A3 flattop, hard-coat anodized |
| Bolt Material | Carpenter 158 steel |
| Extractor Material | 4140 alloy steel |
| Bolt Carrier Material | 8620 steel |
| Cam Pin Material | 4340 alloy steel |
| Carrier Key Material | 4130 alloy steel |
| Front Sight Base | F-marked |
| Included Components | Bolt carrier, charging handle, forward assist, ejection port cover |
This is a standard AR-15 upper receiver and will fit any mil-spec AR-15 lower. The A3 flattop design is compatible with picatinny-rail mounted optics and iron sights.
No. The 4150 CMV steel barrel is not chrome-lined, which is typical of the SOCOM profile. The unlined bore can offer some accuracy advantages and accepts standard AR maintenance practices.
The 1-7" twist is a versatile rate that stabilizes a wide range of 5.56mm loads. It will handle standard 55-grain ball ammunition, heavier match-grade rounds, and most everything in between. For specific bullet compatibility, consult ballistic stability calculators with your exact ammunition.
The gas block journal is .750" diameter, standard for AR-15 builds. Any quality gas block designed for that size can be pinned or clamped per your preference and local regulations.
