Davidson Defense Doomspire 6-inch 1:10 9MM AR-9 Freefloat Tubular M-Lok Handguard Pistol Upper Build Kit

Doomspire 6-inch 1:10 9mm AR-9 Freefloat Tubular M-LOK Pistol Upper Build Kit

The Doomspire is a 9mm AR-9 Upper Build Kit built around a compact 6-inch direct blowback platform. The kit centers on a 6-inch 4150 CrMoV steel barrel with a nitride finish, 1:10 twist rate, and 1/2x28 thread pitch, paired with a muzzle-mounted fake can. The 7075-T6 aluminum hardcoat anodized upper receiver features M4 feed ramps, a forward assist, and an ejection port door assembly, paired with a 10-inch aluminum tubular freefloat M-LOK handguard with a 1.77-inch internal diameter and suppressor-ready clearance. BCG and charging handle are not included.

Key Features

• 6-inch 4150 CrMoV steel barrel, nitride finish, 1:10 twist, 1/2x28 thread pitch, 9mm
• Direct blowback platform
• Muzzle-mounted fake can, 1/2x28
• 7075-T6 aluminum upper receiver, hardcoat anodized, M4 feed ramps, forward assist, ejection port door assembly
• 10-inch aluminum tubular freefloat M-LOK handguard, 1.77-inch internal diameter, suppressor-ready clearance
• BCG and charging handle not included

Perfect For

• AR-9 pistol builders sourcing a compact 9mm upper build kit with a 7075-T6 hardcoat anodized upper receiver with forward assist, 6-inch nitride 4150 CrMoV barrel, and 10-inch tubular freefloat M-LOK handguard with suppressor-ready clearance, pairing it with their own AR-9 bolt carrier group and charging handle
• Shooters building a compact 6-inch 9mm direct blowback AR-9 pistol platform who prefer to select their own BCG while having the nitride 4150 CrMoV barrel, hardcoat anodized upper receiver with forward assist and M4 feed ramps, and suppressor-ready tubular freefloat M-LOK handguard covered in one kit
• AR-9 PCC pistol builders who want a 9mm upper build kit with a 10-inch tubular freefloat M-LOK handguard featuring suppressor-ready clearance and a 1.77-inch internal diameter without sourcing components separately

Barrel and Muzzle Device

The 6-inch barrel is chambered in 9mm and constructed from 4150 CrMoV steel with a nitride finish. The twist rate is 1:10 and the thread pitch is 1/2x28, which matches the included muzzle-mounted fake can. The direct blowback platform design addresses the 9mm cartridge in an AR-9 pistol caliber build without a gas system.

Upper Receiver and Handguard

The 7075-T6 aluminum upper receiver carries a hardcoat anodized finish with M4 feed ramps, a forward assist, and an ejection port door assembly. The 10-inch aluminum tubular freefloat M-LOK handguard features a 1.77-inch internal diameter with suppressor-ready clearance 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-9 pistol platform.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included. Verify compatibility with your specific 9mm AR-9 lower receiver and magazine pattern before use.