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

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

The Davidson Defense Zorin is an AR-15 complete upper chambered in 6mm ARC with an 18-inch government profile barrel. The complete upper includes the upper receiver, barrel, handguard, bolt carrier group, and charging handle. A bolt carrier group and charging handle are 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 with M4 feed ramps, anodized finish
• Freefloat extended quad rail handguard in 6061-T6 aluminum
• 6.5 Grendel II pattern bolt carrier group in 9310 alloy steel, QPQ nitride finish
• Mil-spec M4 charging handle
• GI birdcage flash hider, 5-in-8x24 thread pitch

Perfect For

• AR-15 rifle builders sourcing a complete upper in 6mm ARC
• Builders pairing an 18-inch rifle-gas upper with a stripped lower receiver
• Shooters running a freefloat extended quad rail handguard configuration in 6mm ARC
• Builders looking for a complete upper with bolt carrier group included

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 across the full handguard length.

Upper Receiver and Handguard

The upper receiver is 7075-T6 aluminum with M4 feed ramps and an anodized finish. M4 feed ramps support reliable cartridge feeding from the magazine into the chamber. The freefloat extended quad rail handguard is 6061-T6 aluminum in black, providing full-length quad rail sections for optics, bipods, lights, 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.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is a complete 6.5 Grendel II pattern unit built from 9310 alloy steel with a QPQ nitride finish. The 6mm ARC cartridge headspaces on the 6.5 Grendel II bolt pattern, making this the correct bolt carrier group for this configuration. The mil-spec M4 charging handle completes the upper component set.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.