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

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

The Davidson Defense Gunner Guru is a .450 Bushmaster AR-15 Complete Upper built around a compact 10.5-inch carbine-length gas platform. The kit centers on a Bear Creek 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 micro low-profile gas block at 0.750 diameter is included on the front end. The Caliburn AR-15 upper receiver is finished in nitride, paired with a freefloat M-Lok handguard in black. A .458 SOCOM and .450 Bushmaster bolt carrier group in 9310 alloy steel with a nitride finish and a Mil-Spec AR-15 M4 charging handle complete the upper component set.

Key Features

• Bear Creek 10.5-inch H-Bar barrel, 4150 Chrome Moly Vanadium, phosphate finish, 1:24 twist, 5/8x32 thread pitch
• Carbine-length gas system
• Micro low-profile gas block, 0.750
• KAK .458 compensator, 5/8x32
• Caliburn AR-15 upper receiver, nitride finish
• Freefloat M-Lok handguard, black
• .458 SOCOM and .450 Bushmaster bolt carrier group, 9310 alloy steel, nitride finish
• Mil-Spec AR-15 M4 charging handle

Perfect For

• Builders sourcing a complete .450 Bushmaster AR-15 upper ready to pair with their own lower receiver
• Shooters building a compact 10.5-inch .450 Bushmaster platform who want the BCG and charging handle already included
• AR-15 builders who want a Bear Creek barrel and .458 SOCOM and .450 Bushmaster bolt carrier group covered in one complete upper

Bear Creek Barrel and Front End Components

The Bear Creek barrel is 10.5 inches, 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 micro low-profile gas block at 0.750 diameter is included and pairs with the carbine-length gas system on this barrel.

Caliburn Upper Receiver and Handguard

The Caliburn AR-15 upper receiver carries a nitride finish. The freefloat M-Lok handguard is black, providing M-Lok attachment points along the rail body for accessory mounting. These two components define the exterior structure of the upper assembly on this .450 Bushmaster platform.

Bolt Carrier Group and Charging Handle

The .458 SOCOM and .450 Bushmaster bolt carrier group is 9310 alloy steel with a nitride finish, spec-matched to the .450 Bushmaster platform. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set. These two parts cover the upper internal components beyond the barrel and handguard.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.