Davidson Defense Nestbreaker w/SBA5 Brace 4.5-inch 1:10 9MM AR-9 Freefloat M-Lok Handguard Pistol Full Build Kit

Nestbreaker with SB Tactical SBA5 Brace 4.5-inch 1:10 9mm AR-9 M-Lok Pistol Full Build Kit

The Nestbreaker with SB Tactical SBA5 Brace 4.5-inch 1:10 9mm AR-9 M-Lok Pistol Full Build Kit from Davidson Defense is a pistol-format full build kit for the AR-9 platform chambered in 9mm. The kit includes a 4.5-inch medium-profile barrel, a black 6061-T6 aluminum freefloat M-Lok handguard, a 7075-T6 anodized upper receiver, a 9mm 8620 alloy steel bolt carrier group, a mil-spec charging handle, a lower parts kit, a buffer tube, buffer, recoil spring, end plate, castle nut, and an SB Tactical SBA5 black pistol stabilizing brace. The lower receiver is not included.

Key Features

• 4.5-inch 4150 CrMoV medium-profile barrel in 9mm with 1:10 twist rate
• Nitride barrel finish
• 1/2x36 muzzle thread pitch
• Black 6061-T6 aluminum freefloat M-Lok handguard
• 7075-T6 anodized aluminum upper receiver
• 9mm 8620 alloy steel bolt carrier group with nitride finish, compatible with Glock and Colt magazines
• Mil-spec AR-15 charging handle, black anodized
• Lower parts kit, buffer tube, recoil spring, end plate, and castle nut included
• SB Tactical SBA5 black pistol stabilizing brace

Perfect For

• Builders seeking a compact 9mm AR-9 pistol-format kit with brace included
• Shooters looking for a short-format 9mm pistol build with all primary components
• Builders prioritizing a freefloat M-Lok handguard on the AR-9 platform
• Those wanting a ready-to-complete pistol kit with an SB Tactical SBA5 stabilizing brace

Barrel and Handguard

The 4.5-inch barrel is chambered in 9mm and constructed from 4150 CrMoV steel with a medium profile and a 1:10 twist rate. The nitride finish covers the full barrel surface for corrosion and wear resistance. The muzzle is threaded 1/2x36. The black 6061-T6 aluminum freefloat M-Lok handguard provides M-Lok slot access along its length for accessory mounting. The AR-9 platform operates on blowback, with no gas system components in this configuration.

Upper Receiver and Bolt Carrier Group

The upper receiver is machined from 7075-T6 aluminum with an anodized finish. The 9mm bolt carrier group is constructed from 8620 alloy steel with a nitride finish, features an external extractor, and is compatible with both Glock and Colt pattern magazines. The included mil-spec AR-15 charging handle is black anodized and meets mil-spec dimensional standards for use with the upper receiver included in this kit.

SB Tactical SBA5 Stabilizing Brace

The SB Tactical SBA5 black pistol stabilizing brace is included as the brace component for this pistol-format full build kit. The SBA5 is compatible with the buffer tube included in this kit and is intended for AR-9 pistol-format configurations.

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