Since I bought my SU-22, I have been having problems with 'failure to feed' and 'failure to eject' rounds. I load the magazines with 20 rounds and have yet to go through the 20 rounds without a problem. I have tried various differnt types of ammo - Remington, Winchester, CCI and Federal but have not found a solution. I have shot maybe 500 or 600 rounds through the SU-22. Kel-Tec's manual says not to take the bolt apart because of the springs are under tension or something like that. I'm thinking that the bolt just need a good cleaning.