Davidson Defense Cutlass w/Gauntlet Arms Brace 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit

Davidson Defense Cutlass 8.5 Inch 300 BLK AR-15 Full Build Kit with Gauntlet Arms Brace, Pistol Gas, Heavy Barrel, M-LOK Handguard, Complete BCG

The Davidson Defense Cutlass with Gauntlet Arms brace delivers a complete 300 BLK pistol foundation ready for your lower receiver. This full build kit combines an 8.5 inch heavy barrel with pistol gas metering for reliable cycling across subsonic and supersonic loads, while the 9.25 inch M-LOK free float handguard provides modern mounting space without adding bulk. The Panhead billet upper receiver features an enlarged 458 ejection port for improved ejection reliability, and the included Gauntlet Arms polymer stabilizing brace offers a low profile design that reduces snag points while maintaining secure positioning. With a complete nitride bolt carrier group and all buffer components included, this kit requires only your lower receiver to complete the build.

Key Features

• 8.5 inch heavy profile barrel in 4150 Chrome Moly Vanadium with 1 in 8 twist, optimized for 300 BLK subsonic and supersonic performance
• Pistol length gas system delivers consistent cycling across varied ammunition types
• 9.25 inch M-LOK free float handguard with full length Picatinny top rail for optics and accessories
• Panhead billet upper receiver machined from 6061-T6 aluminum with enlarged 458 ejection port for enhanced ejection reliability
• Gauntlet Arms polymer stabilizing brace with low profile design for reduced snag points
• Complete nitride bolt carrier group with 9310 alloy steel bolt head and 8620 alloy steel body for extended service life
• 5/8x24 threaded muzzle with included flash can, ready for muzzle device swaps
• Micro low profile gas block in steel with 0.750 diameter for secure barrel attachment
• Heavy duty pistol buffer tube with castle nut and end plate, standard carbine spring, and 3 oz buffer included
• Lower receiver not included

Perfect For

• Builders prioritizing 300 BLK versatility with subsonic and supersonic performance in one platform
• Close quarters applications where compact length and quick handling matter most
• Shooters who want threaded muzzle compatibility for various muzzle devices
• First time pistol builders who want a minimalist brace without excessive adjustment mechanisms

Gauntlet Arms Polymer Stabilizing Brace

The Gauntlet Arms brace features a low profile polymer design that reduces weight and eliminates protruding edges that can snag on gear or clothing. The streamlined construction maintains strength while keeping the overall pistol package compact and maneuverable. Compatible with standard mil-spec buffer tubes, the brace provides consistent support for single handed shooting without adding unnecessary bulk to the rear of the firearm.

Panhead Billet Upper with Enhanced Ejection

The Panhead upper receiver is machined from 6061-T6 aluminum and features an enlarged 458 ejection port. This wider opening improves ejection reliability, particularly with heavier subsonic 300 BLK loads. Paired with the anodized finish for corrosion resistance, this upper is built to handle the demands of frequent shooting and varied environmental conditions without compromising fit or function.

Heavy Barrel with Optimal Twist Rate

The 8.5 inch heavy profile barrel uses 4150 Chrome Moly Vanadium steel with a 1 in 8 twist rate, striking the balance needed for stabilizing both lightweight supersonic projectiles and heavy subsonic rounds. The Parkerized finish adds durability, and the 5/8x24 threading accommodates the majority of 300 BLK muzzle devices on the market. Pistol length gas ensures reliable function across the widest range of ammunition types.

Complete Nitride Bolt Carrier Group

The included bolt carrier group pairs a 9310 alloy steel bolt head with an 8620 alloy steel body, both finished with nitride treatment for wear resistance and smooth operation. This material combination provides strength where it matters most while maintaining proper weight distribution for reliable cycling. The nitride finish reduces friction and resists corrosion better than phosphate or uncoated carriers, extending service intervals and maintaining performance under sustained use.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Lower receiver not included. Verify compatibility of all components before installation. Inspect headspace and function before live fire.