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

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

The Davidson Defense Zorin is an AR-15 rifle full build kit chambered in 6mm ARC with an 18-inch government profile barrel. The kit includes the upper assembly, 6.5 Grendel II pattern bolt carrier group, charging handle, Adaptive Tactical EX Performance adjustable stock, mil-spec heavy-duty 6-position buffer tube, 3 oz carbine buffer, lower parts kit, and all associated buffer system hardware. The lower receiver is 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 with M4 feed ramps, anodized finish
• 15-inch freefloat extended quad rail handguard in 6061-T6 aluminum
• 6.5 Grendel II pattern bolt carrier group with 9310 and 8620 alloy steel construction, QPQ nitride finish
• Mil-spec M4 charging handle
• GI birdcage flash hider, 5-in-8x24 thread pitch
• Adaptive Tactical EX Performance adjustable stock
• Mil-spec heavy-duty 6-position buffer tube
• 3 oz carbine buffer

Perfect For

• AR-15 rifle builders sourcing a complete kit around an 18-inch 6mm ARC upper
• Builders completing a stripped mil-spec AR-15 lower receiver
• Shooters running a freefloat extended quad rail handguard in 6mm ARC
• Builders looking for a full rifle build kit with an adjustable stock 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.

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 15-inch 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 with 9310 and 8620 alloy steel construction and 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.

Stock and Buffer System

The Adaptive Tactical EX Performance adjustable stock pairs with the included mil-spec heavy-duty 6-position buffer tube. The 3 oz carbine buffer, lower parts kit, and all associated buffer system hardware cover the core lower completion components outside the serialized lower receiver.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.