Primary Weapon Systems MK114 MOD 2-M 6mm ARC Complete Upper Receiver - 14.5" - FRC Comp

The Primary Weapon Systems MK114 MOD 2-M 6mm ARC Complete Upper Receiver is designed for precision shooting, hunting, and tactical configurations requiring extended-range performance. This complete AR-15 upper assembly utilizes the PWS long-stroke piston operating system with a three-position adjustable gas block for controlled cycling and reduced internal fouling. The system promotes consistent accuracy, manageable recoil impulse, and effective performance when paired with suppressors or high-performance 6mm ARC ammunition. It includes a 14.5-inch barrel with a 1:7.5 twist rate, a PicLok handguard integrating Picatinny and M-LOK mounting surfaces, and a factory-installed FRC 3-port compensator, with components finished in black and manufactured in the United States.

Features:

• 6mm ARC AR-15 upper receiver
• 14.5" barrel with 1:7.5 twist rate
• PWS long-stroke piston operating system
• 3-position adjustable gas system
• Sub-MOA accuracy potential with quality ammunition
• PicLok handguard with Picatinny and M-LOK attachment points
• FRC 3-port compensator compatible with Rearden Atlas suppressor mounting
• Radian Raptor ambidextrous charging handle
• Suppressor-compatible gas regulation