Davidson Defense Gunner Guru 10.5-inch Carbine-Gas 1:24 .450 Bushmaster AR-15 M-Lok Handguard Pistol Upper Build Kit

Davidson Defense Gunner Guru 10.5-inch .450 Bushmaster AR-15 Freefloat M-Lok Pistol Upper Build Kit

The Davidson Defense Gunner Guru 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 H-Bar barrel in 4150 Chrome Moly Vanadium with a phosphate finish, 1:24 twist rate, and 5/8x32 thread pitch, paired with a KAK .458 compensator also threaded at 5/8x32. A low-profile gas block at 0.750 diameter is included on the front end. The Panhead billet upper receiver is 6061-T6 aluminum with an anodized finish, paired with a freefloat M-Lok extended quad rail handguard in black. BCG and charging handle are not included.

Key Features

• 10.5-inch H-Bar barrel, 4150 Chrome Moly Vanadium, phosphate finish, 1:24 twist, 5/8x32 thread pitch
• Carbine-length gas system
• Low-profile gas block, 0.750
• KAK .458 compensator, 5/8x32
• Panhead billet upper receiver, 6061-T6 aluminum, anodized
• Freefloat M-Lok extended quad rail handguard, black
• BCG and charging handle not included

Perfect For

• Builders sourcing a compact .450 Bushmaster AR-15 upper and pairing it with their own bolt carrier group and charging handle
• Shooters building a 10.5-inch .450 Bushmaster pistol platform who already have a lower receiver and prefer to select their own BCG
• AR-15 builders who want a Panhead billet upper and freefloat M-Lok quad rail handguard covered in one upper kit

Barrel and Front End Components

The 10.5-inch H-Bar barrel is chambered in .450 Bushmaster and constructed from 4150 Chrome Moly Vanadium 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 low-profile gas block at 0.750 diameter is included and pairs with the carbine-length gas system on this barrel.

Panhead Upper Receiver and Handguard

The Panhead billet upper receiver is 6061-T6 aluminum with an anodized finish. The freefloat M-Lok extended quad rail handguard is black, providing M-Lok attachment points along the rail body and a quad rail section for additional accessory mounting. These two components define the exterior structure of the upper assembly on this .450 Bushmaster platform.

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