Davidson Defense Checkmate 8.5-inch Pistol-Gas 1:7 556 AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit

Checkmate 8.5-inch Pistol-Gas 1:7 5.56 NATO AR-15 Freefloat M-LOK Pistol Upper Build Kit

The Checkmate is a 5.56 NATO AR-15 Upper Build Kit built around a compact 8.5-inch pistol-length gas platform. The kit centers on an 8.5-inch M4 contour barrel with a 1:7 twist rate and 1/2x28 thread pitch, paired with an A2 GI birdcage flash hider and a black 1/2-inch crush washer. A micro low-profile steel gas block at 0.750 diameter and a pistol-length gas tube are included on the front end. The 7075-T6 aluminum anodized upper receiver features M4 feed ramps, a forward assist, and an ejection port door assembly, paired with a 7-inch freefloat M-LOK handguard in black with a partial Picatinny top rail section. BCG and charging handle are not included.

Key Features

• 8.5-inch M4 contour barrel, 1:7 twist, 1/2x28 thread pitch, 5.56 NATO
• Pistol-length gas system
• Pistol-length gas tube
• Micro low-profile steel gas block, 0.750
• A2 GI birdcage flash hider, 1/2x28, black 1/2-inch crush washer included
• 7075-T6 aluminum upper receiver, anodized, M4 feed ramps, forward assist, ejection port door assembly
• 7-inch freefloat M-LOK handguard, black, partial Picatinny top rail section
• BCG and charging handle not included

Perfect For

• Builders sourcing a compact 5.56 NATO AR-15 pistol upper build kit with a 7075-T6 anodized upper receiver with forward assist, 8.5-inch M4 contour barrel, and 7-inch freefloat M-LOK handguard with partial Picatinny top rail section, pairing it with their own bolt carrier group and charging handle
• Shooters building a compact 8.5-inch pistol-gas 5.56 NATO platform who prefer to select their own BCG while having the M4 contour barrel, anodized upper receiver with M4 feed ramps and forward assist, and freefloat M-LOK handguard with partial Picatinny top rail covered in one kit
• AR-15 pistol builders who want a 5.56 NATO upper build kit with a 7-inch freefloat M-LOK handguard featuring a partial Picatinny top rail section without sourcing components separately

Barrel and Muzzle Device

The 8.5-inch M4 contour barrel is chambered in 5.56 NATO with a 1:7 twist rate and 1/2x28 thread pitch, which matches the included A2 GI birdcage flash hider. A black 1/2-inch crush washer, a micro low-profile steel gas block at 0.750 diameter, and a pistol-length gas tube cover the front end gas configuration on this pistol-length platform.

Upper Receiver and Handguard

The 7075-T6 aluminum upper receiver carries an anodized finish with M4 feed ramps, a forward assist, and an ejection port door assembly. The 7-inch freefloat M-LOK handguard is black with a partial Picatinny top rail section 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-15 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.