Things I liked: The design of the gun. The construction is solid. The power and accuracy. I like the fiber optic "iron" sights, with the caveat that the rear will not stay in place.
Things I would have changed: I would make the rear sight a little more robust. It tends to change adjustment when rifle is cocked. I tried to improve this by putting locktite on the adjusting screw. NOT A GOOD IDEA, as I striped the boss out of the plastic mount. I rebuilt the sight and use the scope more now anyway.
What others should know: Once broken in (which takes at least 200 shots in my opinion) the accuracy with the Nitro Piston is great! After zeroing the scope, I was cutting off 1" pine tree limbs at 30 yards. This would take several shots, eating away a piece of limb each time. I was using the Ballistic v2.5.4 program to calculate the hold over since I was shooting at a 45 degree angle up. It was dead on! I could clip a 1/2" limb with one shot. I am justifying the purchase by not needed a tree trimmer!
Things I liked: Installs easily and worked great on my AR-22 upper
Things I would have changed: Nothing
What others should know: This also works well on rimfire and looks as sturdy as the one I use on the AR-15.
Things I liked: The design is really good. Having the 6 screw mount is rigid. the 3 expansion hole are helpful i removing the mount.
Things I would have changed: It still needs a stop pin.
What others should know: I tried this to solve my scope creep on a Gamo Whisper Nitro Piston and the creep still occurred. It did slow it a little but it moved about 1/16" after 20 shots.