Also known as: 22 TCM
Rock Island Armory developed the .22 Tuason Craig Micromagnum, or TCM. Originally called the .22 Micro-Mag, it is a bottlenecked cartridge used with 40-grain jacketed hollow points. The design is based on the .223 Remington case, but it was shortened down so that the shoulder sits at about the same length as the case mouth of a 9x19mm cartridge. You can only find firearms chambered for the .22TCM from Rock Island Armory and Armscor is the only place the manufactures the needed ammunition.