I was really wanting that GG 17.5 but it unobtainium at the time. The c02 being more powerful was just icing on the cake. I use it for GSSF practice. I built a pellet trap and a spreadsheet for target scaling. I can set up all the stages and print scaled targets for whatever range I want to shoot (within reason) and get a same sized target presentation as a real match that I can shoot in my garage or back yard.