Mag Cmmg Mk4/ar15 5.7x28mm

The CMMG Mk4/AR15 5.7x28mm magazine is a purpose-built feed system designed to convert standard AR15 lower receivers into the 5.7x28 cartridge platform. This magazine pairs exclusively with CMMG's 5.7x28 Radial Delayed Blowback uppers and Mil-Spec AR15 lower receivers, delivering the ballistic efficiency and capacity of the modern intermediate cartridge in a modular AR configuration.

The redesigned magazine incorporates upgraded feed lips engineered for reliable chambering and extraction across the velocity envelope of 5.7x28 ammunition. The stylized texture grip on the magazine body enhances control and facilitates rapid mag changes under stress, while the engraved "5.7x28mm" designation eliminates confusion in mixed-caliber operations. Available in both 10-round and 32-round capacities, the magazine's geometry is optimized for the 5.7x28 cartridge dimensions, ensuring consistent seating and feeding performance. Weighing 0.38 lbs per unit, it maintains a compact profile suitable for tactical environments where ammunition count and weapon balance matter.

This magazine serves operators, competitive shooters, and AR platform enthusiasts who have invested in CMMG 5.7x28 conversion uppers. The 5.7x28 cartridge itself provides intermediate ballistics between 9mm and 5.56, making it effective for intermediate-range precision shooting and training scenarios where 5.56 recoil and cost exceed mission requirements. Compatibility is restricted to CMMG's proprietary 5.7 uppers and standard Mil-Spec lower receivers; cross-compatibility with other 5.7 platforms or standard AR magazines is not possible. Purchase spares to ensure magazine availability during extended range sessions or operational use.