Factory Ruger Mark IV 22/45 .22 LR 10 Round Magazine, - 90599. The Ruger Mark IV 22/45 Magazine is a standard factory OEM replacement magazine. This magazine is for Mark IV 22/45 models chambered in .22 Long Rifle and holds 10 rounds of ammunition. It is made of steel and is made to Ruger specifications and tolerances, using the same manufacturing and materials as the original equipment magazines, ensuring perfect fit and operation.
