Davidson Defense Zorin 18-inch Rifle-Gas 1:7.5 6MM ARC AR-15 Freefloat M-Lok Handguard Rifle Upper Build Kit

Davidson Defense Zorin AR-15 Upper Build Kit - 18-inch 6mm ARC Rifle-Gas 1:7.5 Freefloat Extended Quad Rail Handguard

The Davidson Defense Zorin is an AR-15 upper build kit chambered in 6mm ARC with an 18-inch government profile barrel. The kit includes the upper receiver, barrel, handguard, and GI birdcage flash hider. The 15-inch freefloat extended quad rail handguard gives the forend a full-length accessory platform across the handguard. A BCG and charging handle are not included.

Key Features

• 18-inch 4150 CrMoV steel government profile barrel
• Nitride barrel finish
• 1:7.5 twist rate
• 5-in-8x24 thread pitch
• Rifle-length gas system with .750 O.D. steel micro low-profile gas block
• 7075-T6 aluminum upper receiver, anodized finish
• 15-inch freefloat extended quad rail handguard in 6061-T6 aluminum
• GI birdcage flash hider, 5-in-8x24 thread pitch

Perfect For

• AR-15 rifle builders sourcing an upper build kit in 6mm ARC
• Builders pairing an 18-inch rifle-gas upper with their own BCG and charging handle
• Shooters running a freefloat extended quad rail handguard configuration in 6mm ARC
• Builders completing a full-length accessory platform on an AR-15 upper assembly

Barrel and Gas System

The 18-inch government profile barrel is 4150 CrMoV steel with a nitride finish and a 1:7.5 twist rate optimized for the 6mm ARC caliber. The muzzle is threaded at 5-in-8x24 and pairs with the included GI birdcage flash hider. The rifle-length gas system uses a .750 O.D. steel micro low-profile gas block positioned beneath the handguard, keeping the forend profile clean and unobstructed.

Upper Receiver and Handguard

The upper receiver is 7075-T6 aluminum with an anodized finish. The 15-inch freefloat extended quad rail handguard is 6061-T6 aluminum in black, providing full-length quad rail sections for optics, lights, bipods, grips, and other attachments across the entire handguard surface. The handguard extends beyond the 18-inch barrel length, with the muzzle device providing the necessary clearance past the handguard. The 6mm ARC configuration requires a 6.5 Grendel II pattern bolt carrier group, which is not included with this upper build kit.

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