After reading about the benefits of high pressure air guns, I wanted to give them a try, but the investment was daunting. $400-500 for the rifle, $300 for the scuba tank or nearly the same for a hand pump. I could not afford to buy more than one of these items at a time. The sensible thing to do would have been to buy a Marauder and run it on Co2 until I had the money for a tank or a pump, but the thought of relying on a scuba shop to fill a tank or all of that pumping turned me off to both of those options. I was looking thru the GTA forums and found post talking about converting a QB-79 to HPA. I was hooked (---- you dark side!!!) and began investigating converting my QB-78 to HPA. It turned out that this could be done for about $100 with a 48 cubic inch air tank and an umbilical. Once I figured that out, I took the plunge and ordered a Shoebox compressor. No scuba tanks or hand pumps for me! Below are my gun that I have had for a couple of years with the new tank, umbilical and Shoebox.I pressurize the tank to 3K and I can shoot all day on that. I was a little concerned about going over to the dark side and the sound of evil laughter that accompanied every bulls-eye shot really concerned me until I realized I was the one laughing. I have also noticed that I now cackle and rub my hands together as I watch my shoe box do all the hard work. I can only assume this behavior is normal and common to others on the dark side.By the way I was told there are cookies over here. Ill send a follow-up post as soon as I find them. edited due to language.