Sorry, wish I could feel good about the P10 models. Love the accuracy and the way they feel when I shoot. Problem my 2 Czech models work perfectly. My 2 Kansas models won't free fall the mags. I have removed slight material and polished the inside grip and thought I was good. In the house the mags fall free, empty or fully loaded. Went to the range yesterday, outside temp 29 degrees mags wouldn't drop 1/8 of an inch. My Czech made ones no problem with nothing done. Will be going back to my hammer fired CZs.