Davidson Defense Mission Manager 10.5-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat Quad-Rail Handguard Pistol Upper Build Kit

Davidson Defense Mission Manager 10.5-inch 5.56 NATO AR-15 Freefloat Quad-Rail Pistol Upper Build Kit

The Davidson Defense Mission Manager is a 5.56 NATO AR-15 Upper Build Kit built around a compact 10.5-inch carbine-length gas platform. The kit centers on a 10.5-inch M4 contour barrel in stainless steel with a 1:7 twist rate and 1/2x28 thread pitch, paired with a knurled linear compensator with straight flutes in black and a crush washer. A micro low-profile steel gas block at 0.750 diameter and a stainless steel gas tube are included on the front end. The upper receiver is 7075-T6 aluminum with an anodized finish, M4 feed ramps, an ejection port door assembly, and a forward assist assembly, paired with a 10-inch freefloat quad-rail handguard in 6061-T6 aluminum with an anodized finish and a barrel nut included. BCG and charging handle are not included.

Key Features

• 10.5-inch M4 contour barrel, stainless steel, 1:7 twist, 1/2x28 thread pitch
• Carbine-length gas system
• Stainless steel gas tube
• Micro low-profile steel gas block, 0.750
• Knurled linear compensator, straight flutes, black, 1/2x28, crush washer included
• 7075-T6 aluminum upper receiver, anodized, M4 feed ramps, ejection port door assembly, forward assist assembly
• 10-inch freefloat quad-rail handguard, 6061-T6 aluminum, anodized, full-length top Picatinny rail, quad rail accessory mounting, barrel nut included
• BCG and charging handle not included

Perfect For

• Builders sourcing a compact 5.56 NATO AR-15 upper build kit and pairing it with their own bolt carrier group and charging handle
• Shooters building a 10.5-inch carbine-gas pistol platform who already have a lower receiver and prefer to select their own BCG
• AR-15 builders who want a stainless steel M4 contour barrel and freefloat quad-rail handguard covered in one upper kit

Barrel and Muzzle Device

The 10.5-inch M4 contour barrel is chambered in 5.56 NATO and constructed from stainless steel. The twist rate is 1:7 and the thread pitch is 1/2x28, which matches the included knurled linear compensator with straight flutes in black. A crush washer and a micro low-profile steel gas block at 0.750 diameter paired with a stainless steel gas tube cover the front end gas configuration on this carbine-length platform.

Upper Receiver and Handguard

The upper receiver is 7075-T6 aluminum with an anodized finish, M4 feed ramps, an ejection port door assembly, and a forward assist assembly. The 10-inch freefloat quad-rail handguard is 6061-T6 aluminum with an anodized finish, providing Picatinny rail sections on all four sides with a full-length top rail for optic and accessory mounting. A barrel nut is included with the handguard. These two components define the exterior structure of the upper assembly on this AR-15 platform.

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