SOLGW M4-89 12.5" 5.56 Complete Upper Receiver

SOLGW M4-89 Complete Upper Receiver

The SOLGW M4-89 Complete Upper Receiver is a top-tier upgrade for your AR platform. Chambered in 5.56 NATO and featuring a 12.5" barrel crafted from 4150 CrMoV steel with a QPQ corrosion-resistant finish, this upper is engineered to thrive in the harshest environments. Whether you're running drills, defending your home, or pushing the limits at the range, this upper delivers uncompromising reliability and accuracy.

The carbine-length gas system ensures smooth cycling and reduced recoil, while the SOLGW M89 Drive Lock Rail provides a rock-solid mounting platform for accessories. With a non-reflective hardcoat anodized finish and engraved T-marks for easy optic alignment, this upper is ready to perform right out of the box. No gimmicks. No shortcuts. Just pure performance.

High-Performance Barrel
12.5" 4150 CrMoV steel barrel with QPQ finish offers superior corrosion resistance and long-term durability.

Optimized Twist Rate
1:7 six-groove rifling stabilizes a wide range of bullet weights for enhanced accuracy.

Reliable Gas System
Carbine-length gas system ensures consistent cycling and reduced recoil for smoother operation.

Low-Profile Gas Block
.750” nitride-treated block with knurled head set screws for secure, no-fail performance.

Durable Upper Receiver
Forged from 7075-T6 aluminum and finished with mil-spec hardcoat anodizing for rugged, non-reflective protection.

Premium Handguard
SOLGW M89 Drive Lock Rail provides a secure, modular platform for optics, lights, and grips.

Engraved T-Marks
Easy reference points for repeatable optic mounting and accessory alignment.

Ready for Customization
No sights included, giving you full control over your preferred optic setup.

Specifications:

• Caliber: 5.56 NATO
• Barrel Length: 12.5"
• Barrel Material: 4150 CrMoV Steel
• Barrel Finish: QPQ Corrosion Resistant
• Twist Rate: 1:7, Six Groove
• Gas System: Carbine-Length
• Gas Block: .750” Lo-Pro, Nitride Treated, Knurled Head Set Screws
• Muzzle Device: A2 Flash Hider
• Receiver Material: 7075-T6 Aluminum Forgings
• Receiver Finish: Mil-Spec Hardcoat Anodized, Non-Reflective
• Handguard: SOLGW M89 Drive Lock Rail
• Additional Features: Engraved T-Marks on Upper Receiver
• Sights: Not Included