Davidson Defense Cutlass 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Complete Upper Build

Davidson Defense Cutlass 8.5 Inch 300 BLK AR-15 Complete Upper, Pistol Gas, Heavy Barrel, M-LOK Handguard, Complete BCG

The Davidson Defense Cutlass complete upper delivers a ready to install upper assembly for 300 BLK builds that demand close quarters capability. This upper pairs 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 real estate without adding unnecessary weight. The Panhead billet upper receiver features an enlarged 458 ejection port for improved reliability, and the included nitride bolt carrier group and mil-spec charging handle make this a drop in solution for any mil-spec AR-15 lower receiver. The 5/8x24 threaded muzzle accommodates a wide range of 300 BLK muzzle devices on the market.

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
• Complete nitride bolt carrier group in 9310 alloy steel for extended service life
• AR-15 mil-spec charging handle included for immediate installation
• 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
• Parkerized barrel finish for corrosion resistance and long term durability

Perfect For

• Builders upgrading existing AR-15 pistols to 300 BLK for improved subsonic and supersonic performance
• Close quarters applications where compact length and quick handling matter most
• Shooters who want a complete upper that installs directly onto their existing lower receiver
• First time upper builders who want all critical components included without separate sourcing

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 is machined from 9310 alloy steel and finished with nitride treatment for wear resistance and smooth operation. This finish reduces friction and resists corrosion better than phosphate or uncoated carriers, extending service intervals and maintaining performance under sustained use. The mil-spec charging handle completes the assembly, allowing for immediate installation onto any standard AR-15 lower receiver.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Verify compatibility of all components before installation. Inspect headspace and function before live fire.