Having some issues with this gun. The usual failure to extract which was corrected by a Wolff extra power extractor spring. Needed to have chamber polished. But the slide is just way too hard to pull back. Not for lack of something to grab but because of resistances. I'm comparing mechanics to Beretta PX4 in 40 cal. CZ has 14 lb recoil spring. Beretta has 18 lb spring. Beretta slide is easier to pull back. So far, I've found two reasons. CZ slide clearly gets more difficult to pull when it hits the hammer. The CZ slide hits the hammer about 5 or 6 mm closer to the pivot point than the Beretta, hence less leverage on the hammer. Not much I can do about that. I've had the sharp corner taken off the slide where it contacts the hammer and had the hammer face polished. Didn't help. But when I pull the slide back with the hammer already cocked, I feel another resistance. It's the transfer bar. It starts off in a notch in the slide rails which level out, pushing it down before it does it's thing. The transition angle from the notch to the level edge of the slide is pretty steep. Not a lot that can be done about that either. When I push the bar down with my finger, it feels gritty and does not move smoothly at all. I do feel that there should be a remedy for this. Actually I think it's something that should had resolved itself during break-in but it didn't. Got it back in the shop in hopes that they can do something with it. Love shooting it.