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

Blem Reachback 8.5-Inch .300 BLK AR-15 Pistol Upper Build Kit

This upper build kit combines an 8.5-inch Bear Creek Arsenal 4150 Chrome Moly Vanadium barrel with a blemished 7-inch freefloat M-Lok handguard, chambered in .300 Blackout. The kit includes an anodized 7075-T6 aluminum upper receiver with M4 feed ramps, micro low-profile gas block, pistol-length gas tube, GI birdcage flash hider, and forward assist assembly. This is a blemished handguard with cosmetic imperfections that do not affect function. BCG and charging handle are not included.

Key Features

• Blem handguard, cosmetic imperfections do not affect function
• 8.5-inch Bear Creek Arsenal heavy barrel, 4150 Chrome Moly Vanadium with parkerized finish, 1:8 twist rate
• Blem 7-inch freefloat M-Lok handguard, hardcoat anodized black, full-length Picatinny top rail, integrated QD sling sockets
• Anodized AR-15 upper receiver with M4 feed ramps, 7075-T6 aluminum
• Pistol-length gas system with stainless gas tube and .750 micro low-profile gas block
• 5/8x24 threaded barrel with manganese phosphate GI birdcage flash hider
• Forward assist assembly included

Perfect For

• Budget-conscious .300 Blackout builds requiring upper assemblies
• Shooters prioritizing value over cosmetic perfection
• Builders seeking Bear Creek Arsenal heavy profile barrels
• Configurations demanding freefloat M-Lok handguards with integrated QD sling sockets

Blem Handguard Value

This kit features a blemished 7-inch freefloat M-Lok handguard with minor cosmetic imperfections such as finish irregularities or surface marks. These blemishes do not affect structural integrity, M-Lok slot functionality, Picatinny rail mounting, QD socket operation, or barrel freefloat performance. The blem designation provides significant value for builders focused on function.

.300 Blackout Chambering

.300 Blackout provides versatility across subsonic and supersonic ammunition in a compact platform. The caliber delivers effective terminal performance at close to intermediate ranges while maintaining compatibility with standard AR-15 lower receivers and magazines.

M-Lok Freefloat Handguard Features

The 7-inch freefloat M-Lok handguard features 6061-T6 aluminum construction with hardcoat anodized black finish, full-length Picatinny top rail for optics mounting, and integrated QD sling sockets for direct sling attachment. The freefloat design isolates the barrel from external pressure, supporting accuracy in compact upper configurations.

Pistol-Length Gas System

This kit uses a pistol-length gas system with a stainless gas tube and .750 micro low-profile gas block positioned beneath the handguard. The pistol-length configuration is optimized for the 8.5-inch barrel length.

Compatibility and Assembly

This upper build kit is compatible with standard AR-15 lower receivers. All components use mil-spec dimensions and threading, including the 5/8x24 TPI muzzle threads matching the included GI birdcage flash hider.

BCG and charging handle are not included. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.