BudsGunShop.com - 22TCM or 22TCM9R

edward I shoot and load for both the 22tcm bullet is shorter it is not seated deeper "An easy solution would be to load the cartridges with the bullet set back just a tenth of an inch, but then the taper of the bullet would mean that the diameter of the projectile at the crimp would be smaller than the case mouth. In order to shorten the overall length of the cartridge Armscor selected a different kind of bullet. The new bullet is more dome-shaped with an aggressive taper. The load continues to use an open-tip design making it an all-purpose load for plinking, small game hunting and absolute melon obliteration.
Because the only real difference is the bullet, .22 TCM 9R can be used with standard .22 TCM pistols, just not the other way around" guns.com/news/2015/02/17/armscor-drops-new-details-on-22-tcm-9r-glock-conversion-kits

Dan, they are not the same. The basic difference between .22 TCM and .22 TCM 9R is that the bullet is seated more deeply into the casing of the .22 TCM 9R. This makes the rounds shorter, allowing them to fit into a 9 mm magazine.

they are not the same even though they use the same case the original 22tcm required a 38 super mag as the 22tcm was to long to fit in a 9mm magazine. later RIA decided to make conversion kits for some existing 9mm handguns (glock) to overcome the need to use a 38 super mag they redesigned and shortened the bullet to make the OAL shorter. The 22TCM9R is a shortened 22TCM you can shoot 22TCM9r in a 22TCM gun with no issues

they are not the same even though they use the same case the original 22tcm required a 38 super mag as the 22tcm was to long to fit in a 9mm magazine. later RIA decided to make conversion kits for some existing 9mm handguns (glock) to overcome the need to use a 38 super mag they redesigned and shortened the bullet to make the OAL shorter. The 22TCM9R is a shortened 22TCM you can shoot 22TCM9r in a 22TCM gun with no issues