I have a custom CZ-550. and I used QR Alaskan Arms to mount a Trijicon 1-6x24 on this rifle. Why I used QR, well, since this rifle was going to be used for dangerous game (Cow Buffalo & Lioness), I wanted to have the option to remove the scope and use the sights, just in case something went wrong. This rifle made two flights to the hunting destination, and the scope was dead on, no adjustment needed.