I know there have been countless threads about feeding problems. I have a later model 15 22 with the blue spring. I have used fed lightning, cci mini mags, cci stingers and blazers. no FTF with the 50 stingers but everything else so far has had FTF. My next step is to mark the Magazine to see if it is in fact one mag that is causing all the problems. My feeling is that I am dealing with a Magazine issue. I am loading the mag properly and take my time doing so. It's a fun little gun but I've had so many issues that I'm starting to think trade or S&W service. Comments and advice are welcome.