Primary Weapons MK111 Mod 1-M Upper Receiver 11.85 Barrel .223 Wylde

Primary Weapon Systems

Overview

The Primary Weapons Mk111 Mod 1-M Upper Receiver is a complete assembly designed for the AR-15 platform, featuring an 11.85-inch barrel optimized for the .223 Wylde caliber. The 1:8 twist rate offers versatility in stabilizing a range of bullet weights, making it suitable for various applications, from target shooting to tactical use. This upper receiver is often found in builds that prioritize the .223 Wylde chambering, allowing builders to utilize both .223 Remington and 5.56 NATO cartridges efficiently.