WOW Chris!!! you are way ahead of me in discovering that the new CZ 550's are really good rifles. I only have one and plan to rectify that situation very soon. Just had to remove a very bit off the 10% mauser aftermarket mag spring to slip in. Maybe I should not have started this thread as more people will discover just what a great rifle and good deal they are and the Brockman stocks and I might not be able to get one when I have another period of gun poorness! Have fun playing with yours. Another thing I just discovered, The hollow bolt recess is a bit annoying. I pushed in a proper sized cork, sticks out about 1/4 inch and have dipped the bolt knob into some of the Rust-oleum Grip & Guard rubberized tool handle coating. I've had this on an NRA over the couse highpower competition M70 for years. It seems to work out very nicely, just a bit longer than the CZ bolt knob and a bit more tacky and slip resistant. We will see how it works out and how durable it is. Anyway, back to playing with the CZ. Eric