Rock Island Armory TM22 Black Rock Island TM22 22 Long Rifle Rifle Magazine - 25 Rounds - The RIA Imports TM22 Magazine is a standard factory replacement magazine. This magazine is for TM22 Rifles chambered in 22LR and holds 25 rounds of ammunition. It is made of polymer l and is made to Armscor/Rock Island Armory specifications and tolerances, using the same manufacturing and materials as the original equipment magazines, ensuring perfect fit and operation.