Details
Foxhole 10.5-Inch Carbine-Gas 1:8 5.56 NATO AR-15 Free-Float M-LOK Handguard Pistol Complete Upper Build
The Foxhole Complete Upper is built around a 10.5-inch "Sandel" 5.56 NATO barrel machined from 4150 chrome moly vanadium steel in an M4 profile, with a carbine-length gas system, a Phosphate finish, and cryo treatment. It is paired with a black free-float M-LOK handguard and ships with a complete bolt carrier group and a mil-spec M4 charging handle, so the builder receives the core components of a working upper in one package. The short barrel keeps the front end compact and quick to handle, and the 1:8 twist rate suits a wide range of bullet weights in 5.56 NATO.
Key Features
- 10.5-inch "Sandel" M4 profile barrel, 4150 chrome moly vanadium steel, Phosphate finish, cryo treated, 1:8 twist, 5.56x45mm NATO
- Carbine-length gas system with a micro low-profile gas block sized for a .750-inch barrel
- 7075-T6 aluminum upper receiver, anodized finish
- Free-float M-LOK rail handguard, black
- AR-15 GI birdcage flash hider on 1/2x28 threads
- Complete AR-15 bolt carrier group (5.56/.223/.300/.350), 9310 alloy steel carrier, Nitride finish
- Mil-spec AR-15 M4 charging handle included
Barrel and Gas System
The 10.5-inch "Sandel" barrel is machined from 4150 chrome moly vanadium steel in an M4 profile and finished in Phosphate, a matte, corrosion-resistant treatment that gives it a clean, uniform look. The barrel is also cryo treated. Its 1:8 twist rate is suited to a wide range of bullet weights in 5.56 NATO. The barrel runs a carbine-length gas system through a micro low-profile gas block sized for the .750-inch barrel diameter, and the low-profile block helps it sit cleanly beneath a free-float handguard. At the muzzle, 1/2x28 threads carry the included AR-15 GI birdcage flash hider.
Upper Receiver and Handguard
The upper receiver is machined from 7075-T6 aluminum and finished in anodizing, giving it a hard, wear-resistant surface that holds up to regular handling. It is paired with a black free-float M-LOK rail handguard. As a free-float design, it leaves the barrel free of handguard contact, and the M-LOK slots give the builder room to mount lights, grips, handstops, and other accessories wherever the setup calls for them.
Bolt Carrier Group and Charging Handle
The included complete bolt carrier group is rated for 5.56, .223, .300 Blackout, and .350 Legend, with a carrier machined from 9310 alloy steel and finished in Nitride, a surface treatment that adds hardness and corrosion resistance and helps the carrier stand up to repeated cycling. Paired with it is a mil-spec AR-15 M4 charging handle, completing the upper so it is ready to be matched with a compatible lower receiver.
Compatibility
This upper is built for AR-15 lower receivers chambered in 5.56 NATO. Handguard length and material, gas tube details, feed ramp style, ejection port door and forward assist configuration, and crush washer inclusion were not supplied with this listing and should be confirmed before purchase.
Follow all manufacturer instructions and safe handling practices.
Ensure compliance with all applicable federal, state, and local laws.
