Davidson Defense Wyvern 16-inch Carbine-Gas 1:8 6.5 Grendel AR-15 M-Lok Handguard Rifle Upper Build Kit

Wyvern 16-inch 6.5 Grendel AR-15 Upper Build Kit

The Wyvern is built around a 16-inch 6.5 Grendel barrel with an M4 profile, finished in Parkerized/phosphate, paired with a 7075-T6 aluminum upper receiver finished in anodizing. It pairs a 15-inch M-LOK handguard with an AR-15/AR-10 GI birdcage flash hider at the muzzle, running on a carbine-length gas system. BCG and charging handle are not included, leaving the buyer to supply those components separately.

Key Features

• 16-inch 6.5 Grendel barrel, 1:8 twist, M4 profile, Parkerized/phosphate finish
• Carbine-length gas system with micro low-profile steel gas block
• 7075-T6 aluminum upper receiver, anodized finish
• 15-inch M-LOK handguard, black
• AR-15/AR-10 GI birdcage flash hider
• BCG and charging handle are not included.

Barrel and Gas System

The barrel runs 16 inches long, chambered in 6.5 Grendel and finished in Parkerized/phosphate with an M4 profile. It carries a 1:8 twist rate and a 5/8x24 muzzle thread. Gas cycles back to the action through a carbine-length system, running a stainless steel carbine-length gas tube and a micro low-profile steel gas block sized to a .750-inch journal.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum and finished in anodizing, cut with M4 feed ramps for smooth feeding and fitted with an AR-15 forward assist assembly. The ejection port carries a standard .223/5.56 door with its rod and spring installed. Over the barrel sits a 15-inch handguard finished in black, using an M-LOK attachment system along its length.

Muzzle Device

Capping the muzzle is an AR-15/AR-10 GI birdcage flash hider, listed as compatible with .308, 7.62x39, .300 Blackout, and other compatible 5/8x24 applications. It threads onto the barrel's 5/8x24 pattern and is secured with the included 5/8-inch black crush washer.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.

BCG and charging handle are not included.