Davidson Defense Gladius w/SBA3 Brace 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat Tubular M-Lok Handguard Pistol Full Build Kit

Gladius 10.5-inch .300 BLK AR-15 Pistol Full Build Kit with SB Tactical SBA3 Brace

The Gladius 10.5-inch .300 BLK AR-15 Pistol Full Build Kit includes a complete component set centered on a 10.5-inch pistol-gas barrel chambered in .300 Blackout. The barrel features 4150 CrMoV steel construction, a phosphate finish, an HBAR profile, a 1:8 twist rate, and a 5/8x24 thread pitch. The 7075 T6 aluminum upper receiver carries an anodized finish with M4 feed ramps. A tubular M-LOK freefloat handguard in aluminum, a micro low-profile .750 O.D. gas block in barrel steel, and a GI birdcage flash hider with 5/8x24 threading round out the upper component set. The kit also includes an SB Tactical SBA3 adjustable pistol stabilizing brace in black, a mil-spec heavy-duty 6-position buffer tube, a bolt carrier group in 9310 alloy steel with a nitride finish, an M4 mil-spec charging handle, and a lower parts kit with buffer, recoil spring, castle nut, and end plate. Lower receiver not included.

Key Features

• 10.5-inch HBAR .300 Blackout barrel, 4150 CrMoV steel, phosphate finish
• 1:8 twist rate, pistol-gas system, 5/8x24 thread pitch
• 7075 T6 anodized aluminum upper receiver with M4 feed ramps
• Tubular M-LOK freefloat aluminum handguard
• Micro low-profile .750 O.D. barrel steel gas block
• GI birdcage flash hider, 5/8x24 threading, .300 Blackout compatible
• SB Tactical SBA3 adjustable pistol stabilizing brace, black
• Mil-spec heavy-duty 6-position buffer tube
• 9310 alloy steel bolt carrier group, nitride finish, made in the USA
• M4 mil-spec charging handle
• Complete lower parts kit with buffer, recoil spring, castle nut, and end plate

Perfect For

• AR-15 pistol builds in .300 Blackout
• Builders sourcing a complete component set around a 10.5-inch pistol-gas configuration
• Short-barreled .300 BLK platform builds requiring an SB Tactical brace setup
• Gunsmiths and builders adding a USA-made nitride BCG to a .300 BLK pistol build

Barrel and Upper Receiver

The 10.5-inch barrel is chambered in .300 Blackout and uses a pistol-gas configuration with a .750 O.D. low-profile gas block seat. The HBAR profile delivers added mass along the barrel body, and the 4150 CrMoV steel construction carries a phosphate finish. A 1:8 twist rate is standard across this barrel, and the muzzle end is threaded at 5/8x24. The 7075 T6 aluminum upper receiver pairs an anodized finish with M4 feed ramps for reliable cartridge presentation from the magazine.

Handguard and Muzzle Device

The tubular M-LOK freefloat handguard is aluminum construction and provides full-length M-LOK slot access around the tube for accessory attachment. The micro low-profile gas block measures .750 O.D. and is barrel steel construction. The included GI birdcage flash hider carries a 5/8x24 thread pitch and is listed as compatible with .308, 7.62x39, and .300 Blackout.

Brace, Buffer Tube, and BCG

The SB Tactical SBA3 adjustable pistol stabilizing brace in black pairs with the mil-spec heavy-duty 6-position buffer tube included in this kit. The bolt carrier group is 9310 alloy steel with a nitride finish and is made in the USA. Compatibility spans 5.56, .223, .300 Blackout, and .350 platforms. The M4 mil-spec charging handle and a complete lower parts kit with buffer, recoil spring, castle nut, and end plate are also included.

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