Davidson Defense Marauder 10.5-inch Carbine-Gas 1:8 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Full Build Kit, SBR Ready

Marauder 10.5-inch Carbine-Gas 1:8 5.56 NATO AR-15 Freefloat M-LOK Pistol Full Build Kit, SBR Ready

The Marauder is a 5.56 NATO AR-15 Full Build Kit configured for the SBR Ready designation. The kit centers on a 10.5-inch cryogenically treated Sandel government profile steel barrel with a phosphate finish, 1:8 twist rate, and 1/2x28 thread pitch, paired with an A2 GI birdcage flash hider and a black crush washer. A micro low-profile 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 7075-T6 aluminum design with a black anodized finish, M4 feed ramps, an ejection port cover assembly, and a forward assist, paired with a 10-inch freefloat M-LOK handguard in black with a full-length Picatinny top rail. A USA-made complete AR-15 bolt carrier group in black nitride, compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend, 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 with a Mil-Spec A2 style pistol grip, a heavy-duty Mil-Spec 6-position carbine buffer tube, a standard 3 oz carbine buffer, a USA-made standard carbine recoil spring, an AR-15 M16 Mil-Spec receiver end plate, and an AR-15 Mil-Spec 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 cryogenically treated Sandel government profile steel barrel, phosphate finish, 1:8 twist, 1/2x28 thread pitch, 5.56 NATO
• Carbine-length gas system
• Carbine-length stainless steel gas tube
• Micro low-profile gas block, 0.750
• A2 GI birdcage flash hider, 1/2x28, black crush washer included
• 7075-T6 aluminum upper receiver, black anodized, M4 feed ramps, ejection port cover assembly, forward assist
• 10-inch freefloat M-LOK handguard, black, full-length Picatinny top rail
• USA-made complete AR-15 bolt carrier group, black nitride, .223 and 5.56 NATO and .300 Blackout and .350 Legend compatible
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit, Mil-Spec A2 style pistol grip
• Heavy-duty Mil-Spec 6-position carbine buffer tube
• Standard carbine buffer, 3 oz
• Standard carbine recoil spring, made in USA
• AR-15 M16 Mil-Spec receiver end plate
• AR-15 Mil-Spec castle nut
• SBR Ready configuration

Perfect For

• Builders sourcing a complete 5.56 NATO AR-15 pistol full build kit with a cryogenically treated Sandel barrel and USA-made black nitride BCG already included, pairing it with their own lower receiver and selecting their own rear brace or stock
• Shooters building a compact 10.5-inch carbine-gas pistol platform who want the BCG, buffer system, and Mil-Spec 6-position carbine buffer tube covered without a rear interface commitment
• AR-15 builders who want a 10-inch freefloat M-LOK handguard with a full-length Picatinny top rail and complete lower parts kit in an SBR Ready kit

Barrel and Muzzle Device

The 10.5-inch Sandel government profile barrel is chambered in 5.56 NATO and constructed from steel with a phosphate finish and cryogenic treatment. Cryogenic treatment subjects the barrel steel to deep cold temperatures to relieve residual stress in the metal structure. The twist rate is 1:8 and the thread pitch is 1/2x28, which matches the included A2 GI birdcage flash hider. A black crush washer, a micro low-profile 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.

Upper Receiver and Handguard

The 7075-T6 aluminum upper receiver carries a black anodized finish with M4 feed ramps, an ejection port cover assembly, and a forward assist. The 10-inch freefloat M-LOK handguard is black with a full-length Picatinny top rail and M-LOK attachment points along the body for 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 USA-made complete AR-15 bolt carrier group carries a black nitride finish and is compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

SBR Ready Configuration

The complete Mil-Spec AR-15 lower parts kit covers the internal lower receiver components and includes a Mil-Spec A2 style pistol grip. The buffer system includes a heavy-duty Mil-Spec 6-position carbine buffer tube, a standard 3 oz carbine buffer, a USA-made standard carbine recoil spring, an AR-15 M16 Mil-Spec receiver end plate, and an AR-15 Mil-Spec castle nut. This kit ships without a brace, with the brace or stock 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.