The Hard Resolve 7.5 inch full build kit delivers a compact 5.56 NATO setup built around a 7.5 inch barrel with 1:7 twist. The 7 inch freefloat M Lok handguard keeps weight down while providing modular mounting surfaces. This kit includes the upper assembly, bolt carrier group, charging handle, buffer system, lower parts kit, and Magpul BTR stabilizing brace.
The Magpul BTR stabilizing brace provides Magpul quality construction and design. This brace option comes included with the kit, offering a configuration option for compact pistol builds with Magpul ergonomics and proven reliability.
The 7.5 inch barrel with pistol length gas system creates a short, maneuverable setup. The 1:7 twist stabilizes heavier projectiles effectively at close to moderate range. Micro low profile gas block keeps the sight plane clean under the handguard. The pistol gas system provides reliable cycling with standard 5.56 NATO ammunition in a compact configuration.
The bolt carrier group features 9310 alloy steel construction with nitride finish. This material provides enhanced wear resistance and corrosion protection in a high pressure platform. The nitride treatment penetrates the steel surface rather than coating it, maintaining dimensional tolerances while adding durability.
The 7 inch freefloat M Lok handguard extends nearly to the muzzle device, maximizing usable mounting length without adding bulk. M Lok slots allow modular accessory attachment while maintaining a slim profile. Aluminum construction keeps weight manageable on a compact platform.
This kit includes the upper assembly with barrel and handguard, bolt carrier group, charging handle, buffer tube, buffer, recoil spring, castle nut, end plate, lower parts kit, and Magpul BTR stabilizing brace. Lower receiver not included.
Follow safe handling and manufacturer instructions. Lower receiver not included. Ensure compliance with all applicable laws.
Caliber: 5.56 NATO
Barrel Length: 7.5 inches
Barrel Twist Rate: 1:7
Gas System Length: Pistol
Handguard Style: Freefloat M-Lok
Color: Black
Upper Receiver: AR-15 Upper Receiver, M4 Feed ramps
Upper Receiver Material: 7075 T6 Aluminum
Upper Receiver Finish: Anodized
Handguard Material: Aluminum
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
Bolt Carrier: AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
Muzzle Device: AR-15 1/2x28 TPI GI Birdcage Flash Hider
Muzzle Thread Pitch: 1/2x28
Buffer Tube Type: Mil-Spec Heavy-Duty 6-Position Buffer Tube
Buffer Tube Material: Aluminum
Recoil Buffer Weight: 3 oz
Pistol Brace: Magpul BTR Pistol Brace
Gas Block: Micro Low-Profile Gas Block
Gas Block Size: .750 O.D Barrel Steel
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