I just bought two 24 Packs of Pachmayr .22 snap caps on line from Amazon.com. They work great. They say you can only use one snap cap 10 times though, that is if you keep snapping it in the same area each time. I rotate them in and out so they snap on a different place on the rim each time. They have helped loosened up the trigger on my Sig Mosquito and Colt M4 .22 a lot. They are $6.50 for one pack of 24.