Magpul PMAG Ranger Plate Floorplate Loop (Pack of 3) This Ranger Plate is a dedicated fit for all 7.62x51 LR/SR GEN M3 PMAGS. Will NOT fit the older PMAG 20LR magazine, any 5.56x45 or 7.62x39 PMAGS, or any metal magazine. Installation on the base of the magazine Supports quick and controlled high stress magazine changes Pack of three