Davidson Defense Boar Spear 18-inch Mid-Length-Gas 1:24 .450 Bushmaster AR-15 Freefloat M-Lok Handguard Rifle Full Build Kit

Boar Spear 18-inch Mid-Length-Gas 1:24 .450 Bushmaster AR-15 Freefloat M-LOK Rifle Full Build Kit

The Boar Spear is a .450 Bushmaster AR-15 Full Build Kit built around an 18-inch mid-length gas platform. The kit centers on an 18-inch HBAR profile 4150 CrMoV steel barrel with a phosphate finish, 1:24 right-hand twist rate, and 5/8x32 thread pitch, paired with a KAK .458 compensator and a black 5/8-inch crush washer. A micro low-profile steel gas block at 0.750 diameter and a mid-length stainless steel gas tube are included on the front end. The Panhead billet aluminum upper receiver features an enlarged .458 ejection port door, paired with a 15-inch ACE Series freefloat M-LOK handguard. A complete .458 SOCOM and .450 Bushmaster bolt carrier group 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 aluminum carbine buffer tube, a standard 3 oz AR-15 carbine buffer, a USA-made standard AR-15 carbine recoil spring, a Mil-Spec AR-15 M16 receiver end plate, and an AR-15 carbine castle nut. The Adaptive Tactical EX Performance adjustable stock in black rounds out the kit. Lower receiver not included.

Key Features

• 18-inch HBAR profile 4150 CrMoV steel barrel, phosphate finish, 1:24 right-hand twist, 5/8x32 thread pitch, .450 Bushmaster
• Mid-length gas system
• Mid-length stainless steel gas tube
• Micro low-profile steel gas block, 0.750
• KAK .458 compensator, 5/8x32, black 5/8-inch crush washer included
• Panhead billet aluminum upper receiver, enlarged .458 ejection port door
• 15-inch ACE Series freefloat M-LOK handguard
• Complete .458 SOCOM and .450 Bushmaster bolt carrier group
• Mil-Spec AR-15 M4 charging handle
• Complete Mil-Spec AR-15 lower parts kit
• Mil-Spec heavy-duty 6-position aluminum carbine buffer tube
• Standard AR-15 carbine buffer, 3 oz
• Standard AR-15 carbine recoil spring, made in USA
• Mil-Spec AR-15 M16 receiver end plate
• AR-15 carbine castle nut
• Adaptive Tactical EX Performance adjustable stock, black

Perfect For

• Builders sourcing a complete .450 Bushmaster AR-15 full build kit with an 18-inch HBAR phosphate 4150 CrMoV barrel, Panhead billet aluminum upper receiver with enlarged .458 ejection port, KAK .458 compensator, 15-inch ACE Series freefloat M-LOK handguard, platform-specific BCG, and Adaptive Tactical EX Performance adjustable stock already included, pairing it with their own lower receiver
• Shooters building an 18-inch mid-gas .450 Bushmaster rifle platform who want the .458 SOCOM and .450 Bushmaster BCG, charging handle, complete lower parts kit, and Adaptive Tactical EX Performance adjustable stock covered in one kit with a Panhead billet upper and 15-inch ACE Series freefloat M-LOK handguard
• AR-15 builders who want a .450 Bushmaster full build kit with a platform-specific BCG, KAK .458 compensator, and an Adaptive Tactical EX Performance adjustable stock without sourcing components separately

Barrel and Muzzle Device

The 18-inch HBAR profile barrel is chambered in .450 Bushmaster and constructed from 4150 CrMoV steel with a phosphate finish. The twist rate is 1:24 right-hand and the thread pitch is 5/8x32, which matches the included KAK .458 compensator. A black 5/8-inch crush washer, a micro low-profile steel gas block at 0.750 diameter, and a mid-length stainless steel gas tube cover the front end gas configuration on this mid-length platform.

Upper Receiver and Handguard

The Panhead billet aluminum upper receiver features an enlarged .458 ejection port door sized for the .450 Bushmaster cartridge. The 15-inch ACE Series freefloat M-LOK handguard features 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 complete bolt carrier group is compatible with .458 SOCOM and .450 Bushmaster platforms. A Mil-Spec AR-15 M4 charging handle is included to complete the upper component set.

Lower Parts Kit and Buffer System

The complete Mil-Spec AR-15 lower parts kit covers the internal lower receiver components. The buffer system includes a Mil-Spec heavy-duty 6-position aluminum carbine buffer tube, a standard 3 oz AR-15 carbine buffer, a USA-made standard AR-15 carbine recoil spring, a Mil-Spec AR-15 M16 receiver end plate, and an AR-15 carbine castle nut. The Adaptive Tactical EX Performance adjustable stock in black pairs with the included Mil-Spec carbine buffer tube and covers the rear stock interface for this build.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included. Verify compatibility with your specific .450 Bushmaster lower receiver before use.