The other day I had to grab something at Wal Mart, a bicycle tire tube. I noticed a CO2 Tire Inflator made by BELL. It comes with 2 cartridges and was on sale for $9.00. I bought it and a set of 3 tips made by SLIME. Two tips are plastic cones of different sizes for inflatable "toys" and one is a metal pin for inflating sports balls. The tips were 99 cents. Yesterday I spent the day and night deer hunting and I saw deer a little out of range so I did not shoot. I live in the City limits so I can't shoot the rifle outside the house, and the range is closed on Monday and Tuesday. I'm not going to use this rifle for at least 2 weeks. I remembered my Tire Inflator and got it out. I pulled the nipple on the rifle, installed the red plastic cone on the CO2 device and put a cartridge in. Pressed the plastic cone hard to the nipple socket and let her rip. Thunk. The patched ball came right out, no noise no fuss. It was not fast enough to damage anything and only traveled about 10 feet before falling to the ground. I shot another blast of CO2 down the barrel to clear anything remaining. 2 patches later it was clean and ready for the rack. I've not seen CO2 dischargers for guns readily available and on-line they tend to be $34 or so. I encourage you to try this tire inflator from Wal Mart. It worked for me.