Davidson Defense Keen Beacon w/SBA3 Brace 14.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat Quad-Rail Handguard Pistol Full Build Kit

Keen Beacon 14.5-Inch 5.56 NATO AR-15 Pistol Full Build Kit with SBA3 Brace

This full build kit combines a 14.5-inch 4150 CrMoV barrel with a 10-inch freefloat quad-rail handguard, chambered in 5.56 NATO. The kit includes an anodized 7075-T6 aluminum upper receiver with M4 feed ramps, micro low-profile gas block, carbine-length gas system, GI birdcage flash hider, mil-spec charging handle, 5.56x45mm QPQ nitride bolt carrier group, SB Tactical SBA3 adjustable pistol stabilizing brace, mil-spec heavy-duty 6-position buffer tube, 3 oz carbine buffer, spring steel carbine recoil spring, castle nut, end plate, and complete mil-spec lower parts kit. Lower receiver not included.

Key Features

• 14.5-inch M4 profile barrel, 4150 CrMoV steel with parkerized finish, 1:7 twist rate
• 10-inch freefloat quad-rail handguard, 6061-T6 aluminum, black
• Anodized AR-15 upper receiver with M4 feed ramps, 7075-T6 aluminum
• Carbine-length gas system with .750 micro low-profile gas block
• AR-15 5.56x45mm QPQ nitride bolt carrier group, 9310 alloy steel
• SB Tactical SBA3 adjustable pistol stabilizing brace
• Mil-spec heavy-duty 6-position buffer tube with 3 oz carbine buffer, spring steel carbine recoil spring, castle nut, and end plate
• 1/2x28 threaded barrel with GI birdcage flash hider
• Complete mil-spec AR-15 lower parts kit

Perfect For

• Complete 5.56 NATO pistol builds requiring only a lower receiver
• Shooters prioritizing quad-rail Picatinny attachment systems with adjustable braces
• Builders seeking 14.5-inch M4 profile barrels with complete component sets
• Configurations demanding freefloat quad-rail handguards with all required lower parts

5.56 NATO Chambering

5.56 NATO chambering provides compatibility with both 5.56 NATO and .223 Remington ammunition. The 1:7 twist rate stabilizes a wide range of bullet weights including heavier projectiles up to 77 grains.

SB Tactical SBA3 Adjustable Brace

The SB Tactical SBA3 adjustable pistol stabilizing brace provides five positions of length adjustment. The brace pairs with the included mil-spec heavy-duty 6-position buffer tube, 3 oz carbine buffer, spring steel carbine recoil spring, castle nut, and end plate.

Freefloat Quad-Rail Handguard

The 10-inch freefloat quad-rail handguard provides 6061-T6 aluminum construction with continuous Picatinny rails on all four sides for maximum accessory mounting flexibility. The freefloat design isolates the barrel from external pressure, supporting accuracy.

QPQ Nitride Bolt Carrier Group

The 5.56x45mm bolt carrier group features QPQ nitride finish over 9310 alloy steel. The nitride treatment provides corrosion resistance and surface hardness while reducing friction.

Compatibility and Assembly

This full build kit is compatible with mil-spec AR-15 lower receivers. All components use standard AR-15 specifications and threading, including the 1/2x28 TPI muzzle threads matching the included GI birdcage flash hider.

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