Blemished Reachback 8.5-inch Pistol-Gas 1:9 .300 BLK AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, SBR Ready

Blemished Reachback 8.5-inch Pistol-Gas .300 BLK AR-15 SBR Ready Full Build Kit

This is a complete .300 Blackout pistol build kit with everything except the serialized lower receiver. The 8.5-inch 4150 CrMoV barrel pairs with a 7075-T6 upper receiver and freefloat M-Lok handguard designed for accuracy and modularity. Pistol-length gas system keeps the platform compact. The kit includes bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, castle nut, and end plate. This is a blemished unit, meaning the finish has cosmetic marks that don't affect function.

Key Features

• 8.5-inch 4150 CrMoV barrel, 1:8 twist, 5/8x24 threads, phosphate finish
• 7075-T6 anodized upper receiver with M4 feed ramp
• Freefloat 7-inch M-Lok handguard in 6061-T6 aluminum
• Pistol-length gas system with 0.750 micro low-profile gas block
• Complete USA-made bolt carrier group in 9310 nitride
• Mil-spec charging handle and lower parts kit included
• SBR Ready configuration
• Blem finish with no functional impact

SBR Ready Configuration

This kit ships without a brace, making it intended for customers selecting their own final setup based on their compliance needs. The configuration is designed for flexibility, allowing you to choose between a brace for pistol use or a stock once registered as an SBR. The buffer tube, buffer, and recoil spring are included to support either configuration path you select.

Freefloat M-Lok Handguard Design

The 7-inch M-Lok handguard floats freely from the barrel, isolating it from upper receiver contact. This design reduces harmonics and supports consistent accuracy. The handguard provides mounting space for accessories without adding weight or complexity. M-Lok slots offer tool-free attachment for rail sections and tactical components.

.300 Blackout Ballistics and Barrel Twist

The 1:8 twist rate stabilizes .300 Blackout ammunition across a wide range of grain weights, from 110-grain supersonic to 220-grain subsonic loads. The 8.5-inch barrel length keeps velocity moderate while maintaining the platform's compact profile. The 5/8x24 thread pitch accepts standard suppressors and muzzle devices designed for .300 Blackout or larger calibers.

Included Components and What's Not

Lower receiver not included. The kit provides everything else needed to complete a lower receiver: bolt carrier group, charging handle, lower parts kit, buffer tube, buffer, recoil spring, castle nut, end plate, and crush washer. You'll need a serialized AR-15 lower receiver to complete the build.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Ships without a brace. Do not attach a stock unless compliant with applicable laws. Lower receiver not included.