Details
Davidson Defense Cutlass 8.5 Inch 300 BLK AR-15 Upper Build Kit, Pistol Gas, Heavy Barrel, M-LOK Handguard
The Davidson Defense Cutlass upper build kit delivers a complete upper assembly for 300 BLK builds that demand close quarters capability. This kit 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 5/8x24 threaded muzzle accommodates a wide range of 300 BLK muzzle devices on the market. BCG and charging handle are not included.
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
- 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
- BCG and charging handle are not included
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 threaded muzzle compatibility for various muzzle devices
- Experienced builders who already have a preferred bolt carrier group and charging handle
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.
M-LOK Handguard with Full Top Rail
The 9.25 inch free float handguard extends just past the muzzle device, providing ample mounting space for lights, lasers, grips, and other accessories without adding bulk. M-LOK slots run along the sides and bottom for modular attachment, while the full length Picatinny top rail maintains zero for optics and backup irons. Aluminum construction keeps weight manageable without sacrificing strength.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. BCG and charging handle are not included. Verify compatibility of all components before installation. Inspect headspace and function before live fire.
