Davidson Defense Aegis Lightweight w/SBA5 Brace 10.5-inch Pistol-Gas 1:8 .338 ARC AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Aegis Lightweight 10.5-Inch .338 ARC AR-15 Full Build Kit with SBA5 Brace and M-Lok Handguard

The Aegis Lightweight 10.5-Inch .338 ARC AR-15 Full Build Kit includes an upper assembly, bolt carrier group, charging handle, buffer tube, buffer, recoil spring, castle nut, end plate, lower parts kit, and SB Tactical SBA5 brace. The 10.5-inch Bear Creek Arsenal barrel features 4150 CrMoV steel construction with phosphate finish, HBAR profile, and 1:8 twist rate. The upper assembly includes a 7075 T6 aluminum upper receiver with M4 feed ramps and anodized finish, 10-inch ultra-lightweight M-Lok handguard with partial top rail constructed from 6061-T6 aluminum, micro low-profile gas block, and 5/8x24 thread pitch muzzle. The QPQ nitride-finished 6.5 Grendel II BCG is constructed from 8620 alloy steel. Lower receiver not included.

Key Features

• 10.5-inch Bear Creek Arsenal barrel, 4150 CrMoV steel, phosphate finish, 1:8 twist rate
• HBAR profile barrel chambered in .338 ARC with pistol-length gas system
• 7075 T6 aluminum upper receiver with M4 feed ramps, anodized finish
• 10-inch ultra-lightweight M-Lok handguard with partial top rail, 6061-T6 aluminum
• SB Tactical SBA5 pistol stabilizing brace included
• 6.5 Grendel II QPQ nitride BCG, 8620 alloy steel construction
• Micro low-profile gas block, 0.750-inch diameter
• Complete lower parts kit included
• 5/8x24 barrel thread pitch for muzzle devices

Perfect For

• Builders assembling complete .338 ARC AR-15 pistol configurations without a lower receiver
• Shooters seeking full build kits with SBA5 brace and .338 ARC chambering
• Users prioritizing lightweight M-Lok handguard design
• Those requiring all components except the lower receiver for a complete .338 ARC build

Pistol-Length Gas System Configuration

The 10.5-inch barrel pairs with a pistol-length gas system designed for .338 ARC chambering. The micro low-profile gas block measures 0.750 inches in diameter and sits beneath the M-Lok handguard. The pistol gas system length provides the dwell time necessary for reliable cycling with .338 ARC ammunition in a 10.5-inch barrel configuration.

.338 ARC Chambering and HBAR Profile

The .338 ARC chambering utilizes the 6.5 Grendel case as its parent cartridge and accepts .338 caliber projectiles. The HBAR profile barrel provides increased mass and rigidity compared to standard profiles, offering enhanced heat dissipation characteristics. The 1:8 twist rate provides stabilization for .338 ARC projectile weights. The 5/8x24 thread pitch accommodates .30 caliber and larger muzzle devices.

SB Tactical SBA5 Brace and Ultra-Lightweight Handguard

The SB Tactical SBA5 pistol stabilizing brace mounts to the included buffer tube and provides adjustable length of pull through the 6-position adjustment mechanism. The 10-inch ultra-lightweight M-Lok handguard features 6061-T6 aluminum construction with anodized black finish and includes a partial top Picatinny rail section. The full build kit includes all components necessary for a complete .338 ARC AR-15 pistol except the lower receiver, including upper assembly, 6.5 Grendel II BCG compatible with .338 ARC, charging handle, buffer system, complete lower parts kit, and SBA5 brace.

Lower receiver not included. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.