Keep enough ammo on hand to stay out at the range all day long by equipping yourself with plenty of these original equipment Walther Colt M4 .22 LR magazines. This 30 round clip is designed specifically for the Umarex and Walther Colt M4 and M16 rimfire and HK 416 rifles and pistols, so you don't have to worry about compatibility. Specifications and Features: OEM Replacement magazine Caliber: .22LR Capacity: 30 rounds Finish: black polymer