Davidson Defense Phasebreak 16" 8.6 BLK AR-10 Complete Upper, Suppressor Ready, 1:3 Twist, M-LOK

Davidson Defense 8.6 Blackout AR-10 Complete Upper Build

This is a suppressor-ready AR-10 upper built on the 8.6 Blackout platform with a 16-inch barrel, freefloat M-Lok handguard, and a nitride bolt carrier group. The adjustable gas block and carbine-length gas system give you control over cycling for suppressed or unsuppressed shooting, while the SOCOM profile barrel handles both subsonic and supersonic loads.

Key Features

• 16-inch SOCOM profile barrel with M18x1.5 muzzle threads for suppressor mounting
• Freefloat "Friz" 15-inch M-Lok handguard for rail flexibility and accuracy
• Adjustable low-profile gas block for tuning suppressed or unsuppressed operation
• Recoil Technologies nitride bolt carrier group rated for .308 Winchester, 6.5 Creedmoor, and .243 Winchester
• Carbine-length stainless steel gas tube with .875-inch diameter journal
• DPMS low-profile upper receiver with assembled ejection port door and no forward assist
• Type III hardcoat black anodized upper receiver finish

Perfect For

• Suppressor-ready AR-10 builds on a tight budget
• Shooters wanting a versatile 8.6 Blackout platform with proven reliability
• Hunters and precision shooters using subsonic ammunition
• Builders needing a complete upper without sourcing individual components

Suppressor Integration and Tuning

The M18x1.5 muzzle threads accept standard suppressors designed for large-format rifles. The adjustable gas block allows you to dial in the right amount of gas for your specific suppressor and ammunition combination, reducing felt recoil and improving reliability with both subsonic and full-power loads. This level of control is essential when running a can on an AR-10 platform.

8.6 Blackout Platform and Ammunition

The 8.6 Blackout is a large-bore cartridge designed specifically for suppressed fire. This upper runs the 1:3 twist rate needed to stabilize heavier subsonic projectiles while maintaining accuracy with standard supersonic loads. The SOCOM profile barrel balances weight and durability for both hunting and tactical applications.

Bolt Carrier Group Compatibility

The Recoil Technologies nitride BCG is rated for .308 Winchester, 6.5 Creedmoor, and .243 Winchester. This upper is chambered in 8.6 Blackout, which uses the same bolt face as .308 Winchester, so the BCG functions reliably across these platforms. Always verify ammunition compatibility before loading.

Assembly and Compatibility

Bolt carrier group and charging handle are included. Lower receiver not included. This upper fits standard DPMS pattern AR-10 lower receivers. Verify your lower receiver is DPMS compatible before assembly.

May Dropship from Davidson Defense.

Verify suppressor compatibility before mounting. Ensure secure mounting and proper headspace before operation. Use only in accordance with applicable federal, state, and local laws.