This is the Ruger Mark IV Target Model 40159. It requires 22 lr ammo. The 22 is 4.6 cents a round compared to 18.5 cents a round for 9 mm and over 30 cents a round for 38 special. At the .139 lower price per round than 9 mm, I can pay for the gun within a year. That is why I bought it. I tried it this past Wednesday and it was great. With the weight of the gun, there is very little recoil. I didn't feel it. Out of 100 rounds, I had 89 in the middle of the target and the other 11 inside the eight. It's beautiful too and it comes in several models.