I see that other people share my experiences with the CZ550 & CZ602. Every CZ550 that I have had experience with has needed at least one full days work to make it reliable for dangerous game. Do not take me wrong I love the CZ550 after they have had a lot of work. My CZ550 required about three days work to make it smooth and reliable. My wife's required one full days work after it had been reworked by a well known competent gunsmith (no name mentioned). The CZ602s that I work on for Zimbabwe CAMPFIRE are rugged and smooth the only work that they require is from daily abuse, mostly lost parts or broken parts especially stocks. I have never experienced a M-70 (control feed) that need work, just use! If only CZ made their 550 in .404!