Primary Weapon Systems MK114 MOD 1-M .223 Wylde Complete Upper Receiver - 14.5"

The Primary Weapon Systems MK114 MOD 1-M Complete Upper Receiver is built around a long-stroke piston system to support smooth operation and consistent performance. Chambered in .223 Wylde, this upper features a 14.5" 41V50 barrel with a 1:8 twist and 1/2x28 threading, paired with a 13.5" M-LOK handguard that offers ample mounting space while keeping weight balanced. A three-position adjustable gas block allows tuning for different shooting setups, including suppressed use. The long-stroke piston system helps manage heat and fouling away from the receiver. A Radian Raptor LT charging handle is included, and the upper ships ready for installation of a muzzle device or suppressor mount. Total weight is approximately 4 lb 4 oz as configured.

Features:

• Chambered in .223 Wylde
• 14.5" 41V50 barrel with 1:8 twist
• Threaded 1/2x28 muzzle
• Long-stroke piston operating system
• Three-position adjustable gas block
• 13.5" M-LOK handguard
• Radian Raptor LT charging handle
• Fits mil-spec AR-15 lower receivers