Davidson Defense Hammer Forge 10.5-inch Carbine-Gas 1:24 .450 Bushmaster AR-15 Freefloat Keymod Handguard Pistol Upper Build Kit

Hammer Forge 10.5-inch Carbine-Gas 1:24 .450 Bushmaster AR-15 Freefloat Keymod Pistol Upper Build Kit

The Hammer Forge is a .450 Bushmaster AR-15 Upper Build Kit built around a compact 10.5-inch carbine-length gas platform. The kit centers on a 10.5-inch Bear Creek Arsenal HBAR profile steel barrel with a phosphate finish, 1:24 twist rate, and 5/8x32 thread pitch, paired with a KAK .458 compensator and a black crush washer. A micro low-profile steel gas block at 0.750 diameter and a carbine-length stainless steel gas tube are included on the front end. The upper receiver is a Panhead billet aluminum design configured for .458 SOCOM and .450 Bushmaster with an enlarged .458 ejection port door installed and an ejection port door, rod, and spring included, paired with a 10-inch ultra-slim freefloat Keymod handguard in black. BCG and charging handle are not included.

Key Features

• 10.5-inch Bear Creek Arsenal HBAR profile steel barrel, phosphate finish, 1:24 twist, 5/8x32 thread pitch, .450 Bushmaster
• Carbine-length gas system
• Carbine-length stainless steel gas tube
• Micro low-profile steel gas block, 0.750
• KAK .458 compensator, 5/8x32, black crush washer included
• Panhead billet aluminum upper receiver, .458 SOCOM and .450 Bushmaster compatible, enlarged .458 ejection port door installed, ejection port door, rod, and spring included
• 10-inch ultra-slim freefloat Keymod handguard, black
• BCG and charging handle not included

Perfect For

• Builders sourcing a compact .450 Bushmaster AR-15 pistol upper build kit with a Panhead billet upper receiver featuring an enlarged .458 ejection port, Bear Creek Arsenal HBAR barrel, and KAK .458 compensator, pairing it with their own bolt carrier group and charging handle
• Shooters building a 10.5-inch .450 Bushmaster carbine-gas pistol platform who prefer to select their own BCG while having the HBAR barrel, carbine-length gas system, and ultra-slim freefloat Keymod handguard covered in one kit
• AR-15 pistol builders who want a .450 Bushmaster upper build kit with a Panhead billet upper receiver and KAK .458 compensator at a 5/8x32 thread pitch without sourcing components separately

Barrel and Muzzle Device

The 10.5-inch Bear Creek Arsenal HBAR profile barrel is chambered in .450 Bushmaster and constructed from steel with a phosphate finish. The twist rate is 1:24 and the thread pitch is 5/8x32, which matches the included KAK .458 compensator. A black crush washer, a micro low-profile steel gas block at 0.750 diameter, and a carbine-length stainless steel gas tube cover the front end gas configuration on this carbine-length platform.

Panhead Billet Upper Receiver and Handguard

The Panhead billet aluminum upper receiver is configured for .458 SOCOM and .450 Bushmaster with an enlarged .458 ejection port door installed. An ejection port door, rod, and spring are included. The 10-inch ultra-slim freefloat Keymod handguard is black with Keymod attachment points along the body for accessory mounting. These two components define the exterior structure of the upper assembly on this .450 Bushmaster pistol platform.

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