I recently posted a message indicating I had experienced a cracked frame on my CZ-52 twice on two different frames in the very same place. Since then, I've received a few replies indicating other owners have noticed this same problem Check you frame on the left side just behind the feed ramp in the frame rail area. This is the thin section of metal that has a hole in it to let the tab on the hold open catch ride on the magazine follower. Look for a hairline crack that runs from the top of the frame to the hole for the tab on the hold open catch. Please post your findings.