CMMG Upper Group Resolute for MK4 .22LR 17" Black

The CMMG Upper Group Resolute for MK4 .22LR 17" Black is purpose-built for shooters seeking an economical, low-recoil training solution without sacrificing reliability or modularity. Whether you're a law enforcement trainer running qualification drills, a military small-arms instructor cutting ammunition costs, or a civilian marksman honing fundamentals, this .22 LR upper transforms any standard AR15 lower into a dedicated rimfire platform.

The Resolute platform excels in environments where high-volume repetition is essential—from firearms safety courses to transition-drill practice—because it delivers consistent .22 LR ballistics with the ergonomic familiarity of the AR15 platform. Built by CMMG Inc., a manufacturer with deep roots in AR platform engineering, this upper assembly features a 17-inch barrel optimized for .22 LR velocity and accuracy at typical indoor and outdoor ranges.

The black hard-coat anodize finish resists corrosion and wear during extended training cycles, while the modular architecture allows rapid caliber swaps by simply removing the takedown pins. CMMG's engineering ensures that .22 conversion magazines feed reliably, a critical factor for training consistency and shooter confidence. This product is ideal for law enforcement academies, military bases, and civilian shooters looking to enhance their skills.