Davidson Defense Left Hook w/Gauntlet Arms Brace 10.5-inch 1:8 556 AR-15 Drop-In Quad-Rail Handguard Pistol Full Build Kit

Left Hook 10.5-Inch 1:8 5.56 NATO AR-15 Left-Hand Drop-In Quad-Rail Handguard Pistol Full Build Kit with Gauntlet Arms Brace

The Left Hook Full Build Kit is built around a 10.5-inch 5.56 NATO Bear Creek Arsenal barrel with a carbine-length gas system and a fixed M4-style front sight base, paired with a left-hand Black Diamond Series billet upper receiver, a matched left-handed Davidson Defense bolt carrier group, and a polymer stabilizing brace. Lower receiver is not included.

Key Features

• 10.5-inch Bear Creek Arsenal barrel, M4 profile, 1:8 twist, Parkerized finish
• Carbine-length gas system with fixed M4-style front sight base
• Left-handed slick-side billet upper receiver, Black Diamond Series, black
• 7-inch M4 carbine-length drop-in quad rail handguard, Picatinny rail system
• A2 Birdcage flash hider included
• Davidson Defense premium left-handed M16/AR-15 BCG, Nitride finish, and mil-spec quality M4 charging handle included
• Complete mil-spec AR-15 Lower Parts Kit included
• Polymer stabilizing brace included
• Lower receiver is not included.

Barrel and Gas System

The 10.5-inch Bear Creek Arsenal barrel is built in an M4 profile from 4150 chrome moly vanadium steel with a Parkerized finish and a 1:8 twist rate suited to 5.56 NATO and .223 Remington. It runs a carbine-length gas system through a stainless steel gas tube, and it's built with a fixed M4-style front sight base that includes a front sling attachment point. The muzzle carries an A2 Birdcage flash hider.

Upper Receiver and Handguard

The upper receiver is a left-handed, slick-side billet unit from the Black Diamond Series, finished in black, and it includes the ejection port door assembly with rod and spring. It's paired with a 7-inch M4 carbine-length drop-in handguard built on a quad-rail Picatinny system, finished in black.

Bolt Carrier Group and Charging Handle

A Davidson Defense premium left-handed M16/AR-15 bolt carrier group is included, finished in Nitride to match the upper receiver's left-side charging orientation, along with a mil-spec quality AR-15 M4 charging handle.

Lower Parts Kit and Buffer System

The kit includes a complete mil-spec AR-15 Lower Parts Kit, along with the carbine castle nut, mil-spec receiver end plate, and a USA-made standard AR-15 carbine recoil spring. The buffer system pairs a 3-ounce standard AR-15 carbine recoil buffer with a fixed heavy-duty AR-15 pistol receiver extension.

Brace

A black polymer stabilizing brace is included, mounted to the fixed pistol buffer tube used in this build.

Follow all manufacturer instructions and safe handling practices.

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

Lower receiver is not included.