I have a mosquito standard that I plink with on a daily basis. As for jamming i've have not had any problems with cci mini mags. I like it so much thinking about getting a sport just for the longer barrel. Picked up a brick of Remington Vipers 20 years ago and going to shoot them up this weekend if I have to shoot them in the single shot rifle. Found them in the back of the safe and need to get rid of them. On the other hand I have been shooting .223s that are that old and had no problems.