CMMG Magazine, 22LR, 25 Rounds, Fits MK4/AR15, Flat Dark Earth 22AFC2B-FDE Featuring an impact-resistant polymer tube with a shock-resistant floor plate and compatible with any standard AR-15 lower receiver and converted uppers, the CMMG MK4 / AR15 .22LR 25-Round Magazine offers smooth and consistent operation in virtually any target shooting or training application.