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

Davidson Defense Mission Manager 10.5-inch 5.56 NATO AR-15 Freefloat Quad-Rail Pistol Full Build Kit, SBR Ready

The Davidson Defense Mission Manager is a 5.56 NATO AR-15 Full Build Kit configured for the SBR Ready designation. 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 full-length top Picatinny rail. A complete AR-15 bolt carrier group compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend, made in the USA, and a Mil-Spec AR-15 M4 charging handle complete the upper side. The lower hardware includes a complete Mil-Spec AR-15 lower parts kit, a Mil-Spec heavy-duty 6-position buffer tube, a standard 3 oz carbine buffer, a standard AR-15 carbine recoil spring, an AR-15 M16 Mil-Spec receiver end plate, and an AR-15 carbine castle nut. This kit ships without a brace and is intended for customers selecting their own final setup. Lower receiver 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
• Complete AR-15 bolt carrier group, 5.56 NATO and .223 and .300 Blackout and .350 Legend compatible, made in USA
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec heavy-duty 6-position buffer tube
• Standard carbine buffer, 3 oz
• Standard AR-15 carbine recoil spring
• AR-15 M16 Mil-Spec receiver end plate
• AR-15 carbine castle nut
• SBR Ready configuration

Perfect For

• Builders sourcing a complete 5.56 NATO AR-15 pistol kit with a lower parts kit and USA-made BCG already included, pairing it with their own lower receiver
• Shooters who plan to select their own brace or stock for the rear
• AR-15 builders who want a stainless steel M4 contour barrel and quad-rail handguard with full-length Picatinny rail covered in one SBR Ready 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. These two components define the exterior structure of the upper assembly on this AR-15 platform.

Bolt Carrier Group and Charging Handle

The complete AR-15 bolt carrier group is compatible with 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend, and is made in the USA. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

SBR Ready Configuration

This kit ships without a brace and is intended for customers selecting their own final rear configuration. The buffer tube, buffer, recoil spring, end plate, and castle nut are included as part of the rear hardware, with the brace selection remaining with the buyer.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Ships without a brace. Do not attach a stock unless compliant with applicable laws. Lower receiver not included.