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

Davidson Defense Cutlass 10.5 Inch Pistol Full Build Kit in 300 BLK with Gauntlet Arms Brace and M-Lok Handguard

This Davidson Defense Cutlass full build kit pairs a 10.5 inch barrel with a pistol length gas system for compact reliability in 300 BLK. The Panhead billet upper receiver is machined from 6061-T6 aluminum and anodized for clean lines and durability. The 9.25 inch M-Lok handguard runs nearly flush with the muzzle and gives you attachment points across three sides while keeping the top rail open. The barrel is made from 4150 CrMoV steel with a phosphate finish and comes threaded at 5/8x24 TPI with a standard birdcage flash hider already mounted. The 1:8 twist rate stabilizes subsonic and supersonic 300 BLK loads without issue. This full build kit includes a nitride finished bolt carrier group, mil-spec aluminum charging handle, Gauntlet Arms polymer stabilizing brace, heavy duty pistol buffer tube, buffer, recoil spring, castle nut, end plate, and lower parts kit. Lower receiver not included.

Key Features

• 10.5 inch HBAR barrel in 4150 CrMoV steel with phosphate finish and 1:8 twist rate
• Panhead billet upper receiver machined from 6061-T6 aluminum with Type III anodizing
• 9.25 inch freefloat M-Lok handguard with full length Picatinny top rail
• Pistol length gas system with micro low profile gas block for reliable cycling
• Gauntlet Arms polymer stabilizing brace with heavy duty pistol buffer tube
• Nitride finished bolt carrier group with mil-spec charging handle and complete lower parts kit

Perfect For

• Builders seeking a complete parts package for a compact 300 BLK configuration
• Shooters prioritizing portability with stabilizing brace support
• Those running suppressed setups or subsonic ammunition
• Anyone wanting M-Lok mounting flexibility on a shorter platform

Billet Upper Design and Fit

The Panhead billet upper is CNC machined rather than forged, which gives it tighter tolerances and a more refined appearance compared to mil-spec forgings. The port door and forward assist are integrated smoothly into the design. This upper pairs with standard mil-spec components and maintains compatibility with most lower receivers. The anodized finish resists wear and keeps a consistent look even after extended use.

Barrel Performance in 300 BLK

A 10.5 inch barrel is right in the sweet spot for 300 BLK because the cartridge was designed around short barrels. The 1:8 twist stabilizes both subsonic rounds around 220 grains and lighter supersonic loads in the 110 to 125 grain range. The phosphate finish on the 4150 CrMoV steel protects against corrosion and holds up under heat. The HBAR profile adds rigidity without excessive weight, which helps maintain accuracy during longer strings of fire.

Gauntlet Arms Brace and Buffer System

The Gauntlet Arms polymer stabilizing brace attaches to the included heavy duty pistol buffer tube and provides forearm support during shooting. The buffer tube is machined to handle the weight and recoil characteristics of pistol configurations. The kit includes the buffer, recoil spring, castle nut, and end plate needed to complete the buffer system. This setup works with the pistol gas system to manage recoil and keep the action cycling smoothly.

Complete Build Kit Components

This full build kit includes everything except the lower receiver. The lower parts kit covers the trigger group, magazine release, bolt catch, safety selector, and all associated pins and springs needed to complete a functional lower. The nitride finished bolt carrier group and mil-spec charging handle complete the upper assembly. The M-Lok handguard keeps the barrel freefloated while giving you mounting options for lights, grips, or other accessories along the 3, 6, and 9 positions.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Lower receiver not included. Verify compatibility with your lower receiver and other components before assembly.