Davidson Defense Scalpel w/Gauntlet Arms Brace 5-inch 1:10 9MM AR-9 M-Lok Handguard Pistol Full Build Kit

Scalpel 5-Inch 1:10 9mm AR-9 M-LOK Handguard Pistol Full Build Kit with Gauntlet Arms Brace

The Scalpel Full Build Kit is built around a 5-inch 9mm BC-9 direct blowback barrel with a pistol-caliber billet upper receiver, a 4-inch K-style free-float M-LOK handguard, and a complete 9mm bolt carrier group, charging handle, and polymer stabilizing brace. Lower receiver is not included.

Key Features

• 5-inch BC-9 barrel, slim profile, 1:10 twist, Parkerized finish
• Direct blowback operating system
• 6061 aluminum pistol-caliber billet upper receiver
• 4-inch K-style ultra-lightweight minimalist M-LOK handguard
• KAK Industry 9mm Mini Compensator on 1/2x36 threads with 1/2-inch black crush washer
• 8620 alloy steel 9mm Nitride BCG, compatible with Glock and Colt pattern magazines, 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 Operating System

The 5-inch BC-9 barrel is built in a slim profile with a Parkerized finish and a 1:10 twist suited to 9mm. This build runs a direct blowback operating system rather than a gas-driven cycle. The muzzle carries the KAK Industry 9mm Mini Compensator on 1/2x36 threads, secured with the included 1/2-inch black crush washer.

Upper Receiver and Handguard

The upper receiver is a 6061 aluminum billet unit built for the pistol-caliber AR-15 platform. It's paired with a 4-inch K-style, ultra-lightweight minimalist free-float M-LOK handguard, built without anti-rotation tabs for a slim profile along the short barrel.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is machined from 8620 alloy steel with a Nitride finish and an external extractor, built for compatibility with Glock and Colt pattern magazines. A mil-spec quality AR-15 M4 charging handle is included alongside it.

Lower Parts Kit and Buffer System

The kit includes a complete mil-spec AR-15 Lower Parts Kit with a mil-spec style pistol grip, along with the carbine castle nut and mil-spec receiver end plate. The buffer system pairs an AR-15 9mm carbine buffer with a USA-made standard AR-15 carbine recoil spring, cycling inside a heavy-duty AR-15/AR-style pistol receiver extension.

Brace

A black polymer stabilizing brace is included, mounted to the pistol receiver extension used in this build.

Follow all manufacturer instructions and safe handling practices.

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