Buy MK114 MOD 2 Upper 6MM ARC

Buy PWS MK114 MOD 2 Upper 6mm ARC — a high-performance complete upper receiver engineered for precision shooters who demand superior ballistics, accuracy, and reliability in a modern piston-driven platform.

Chambered in the highly efficient 6mm ARC cartridge, this upper features a 14.5″ barrel and Primary Weapons Systems’ acclaimed long-stroke piston operating system. It delivers flatter trajectories, reduced recoil, and outstanding long-range accuracy while maintaining the legendary reliability and clean-running characteristics PWS is known for.

The MK114 MOD 2 upper is designed to pair perfectly with MOD 2-M ambidextrous lowers, making it an excellent choice for building a versatile precision rifle, pinned & welded legal 16″ configuration, or custom suppressor host.

Key Features & Benefits

• Long-Stroke Piston System: Superior reliability with minimal carbon buildup and gas blowback. Includes a 3-position adjustable gas regulator for optimized suppressed or unsuppressed performance.
• 14.5″ 6mm ARC Barrel: Precision barrel with 1:7.5 twist rate, optimized for the 6mm ARC cartridge. Delivers exceptional accuracy, high velocity, and outstanding terminal performance at extended ranges.
• MOD 2 Forged Upper: Lightweight forged 7075-T6 aluminum receiver with modern styling and enhanced ergonomics.
• Extended M-LOK Handguard: Slim, free-floating design provides maximum accessory mounting flexibility while maintaining excellent rigidity and heat dissipation.
• Suppressor Optimized: Low back-pressure piston system makes it an ideal platform for precision suppressed shooting.
• Premium Components: Enhanced PWS bolt carrier group and high-quality internals designed specifically for the 6mm ARC cartridge.
• Customization Ready: Available with or without muzzle device for pinned & welded builds.

Why Choose the PWS MK114 MOD 2 6mm ARC Upper?

The 6mm ARC offers an outstanding balance of ballistic performance, low recoil, and long-range capability that outperforms traditional .223/5.56 at distance. Combined with PWS’s long-stroke piston system, this upper gives you a cleaner, more reliable, and softer-shooting precision rifle compared to standard direct impingement platforms. Perfect for long-range target shooting, hunting, competition, and tactical applications.

Technical Specifications

• Caliber: 6mm ARC
• Barrel Length: 14.5″ with 1:7.5 Twist
• Gas System: Mid-Length Long-Stroke Piston with 3-Position Adjustable Regulator
• Handguard: Extended Free-Float M-LOK
• Upper Receiver: Forged 7075-T6 MK114 MOD 2
• Operating System: PWS Long-Stroke Piston
• Finish: Hardcoat Anodized Black
• Compatibility: Designed for MK1 MOD 2 / MOD 2-M ambidextrous lowers

Elevate your long-range performance. Add the PWS MK114 MOD 2 Upper 6mm ARC 14.5″ to your cart today and experience next-level precision piston power.