a friends kal-tech 9mm failed to feed after 25 rounds and he ask me to take a look at it. he gave me the rest of the ammo in the box 9mm win. ball. i took it apart and cleaned it up and lubed it and looked at the recoil springs(little one inside a bigger one). i think the little spring caught on the larger spring during recoil and caused the failure to feed. after assembling, cleaning and lubing it fired all the 9mm win. ball and a whole box of rem hard ball with out hitch. the little bugger kicked and it shot to point of aim at 15 yards. it may be some thing to look at if you have failure to feed. eastbank.