Davidson Defense Nox w/SBA6 Brace 4.5-inch 1:7 300 BLK AR-15 M-Lok Handguard Pistol Full Build Kit

Nox 4.5-Inch 1:7 .300 BLK AR-15 M-LOK Handguard Pistol Full Build Kit with SB Tactical SBA6 Brace

The Nox Full Build Kit is built around a 4.5-inch .300 AAC Blackout Bear Creek Arsenal HBAR barrel with a micro-length gas system, a 7000 Series optimized upper receiver, a 4-inch K-style free-float M-LOK handguard, and a complete BCG, charging handle, and SB Tactical SBA6 pistol stabilizing brace. Lower receiver is not included.

Key Features

• 4.5-inch Bear Creek Arsenal HBAR barrel, .300 AAC Blackout, 4150 CMV steel, 1:7 twist, Parkerized finish
• Micro-length gas system, 5.25" gas tube
• 7000 Series optimized upper receiver, Type III hardcoat anodized black, dust cover pin feature
• 4-inch K-style ultra-lightweight minimalist M-LOK handguard
• Steel flash can, Design 4, Black Oxide finish, compatible with 9mm and .350 diameter projectiles, on 5/8x24 threads with 5/8-inch black crush washer
• Complete AR-15 BCG (5.56 NATO, .223 Remington, .300 Blackout, .350 Legend compatible), made in the USA, and mil-spec quality M4-style charging handle included
• Complete mil-spec AR-15 Lower Parts Kit and buffer-system components included
• SB Tactical SBA6 5-position adjustable pistol stabilizing brace included
• Lower receiver is not included.

Barrel and Gas System

The 4.5-inch Bear Creek Arsenal barrel is built in an HBAR heavy profile from 4150 chrome moly vanadium steel with a Parkerized finish and a 1:7 twist rate suited to .300 AAC Blackout. It runs a micro-length gas system through a 5.25-inch gas tube and a micro low-profile steel gas block with a .750-inch diameter, matched to the barrel's .750-inch gas journal. At the muzzle, 5/8x24 threads carry the included steel flash can, Design 4, finished in Black Oxide and compatible with 9mm and .350 diameter projectiles, secured with the supplied 5/8-inch black crush washer.

Upper Receiver and Handguard

The upper receiver is a 7000 Series optimized unit finished in Type III hardcoat black anodizing with a dust cover pin feature, and it includes the ejection port door, rod, and spring. It's paired with a 4-inch K-style, ultra-lightweight minimalist free-float M-LOK handguard, built without anti-rotation tabs for a slim profile along the short barrel.

Bolt Carrier Group and Charging Handle

A complete, US-made AR-15 bolt carrier group is included, rated for 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend, along with a mil-spec quality AR-15 M4-style charging handle.

Lower Parts Kit and Buffer System

The kit includes a complete mil-spec AR-15 Lower Parts Kit with a standard A2-style pistol grip and full fire control group, along with the carbine castle nut and mil-spec receiver end plate. The buffer system pairs a 3-ounce standard AR-15 carbine buffer with a USA-made standard AR-15 carbine recoil spring, cycling inside a heavy-duty mil-spec AR-15 six-position carbine buffer tube.

Brace

An SB Tactical SBA6 5-position adjustable pistol stabilizing brace in black is included, mounted to the mil-spec carbine buffer tube used in this build.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.