Just an observation. Yesterday I received 2 10 rnd mags that I had ordered for my 455. They were both sealed in factory packaging. I took them out of the packages and sat them on the table. I noticed that the follower on one looked like it was not coming up all the way like the other one was. I took them both apart and layed them on a paper towel just as they came apart. When the followers were out of both mags, I could see that they had been installed in opposite directions. I was pretty sure I knew which one was correct but I looked at the 5 rnd mag that came with the rifle and verified it. I never loaded the mag to test it first. It may have functioned okay but I kinda doubt it. If I hadn't ordered 2 I may not have even noticed it until I was cursing my CZ at the range for not feeding.