Absolutely necessary for a spring upgrade. The shell cutting to make it fit isn’t too bad, even on the newer Kronos models. Just wish it came with a cutting guide for the newer models because there is some extensive cutting to be done, but there are enough videos on YouTube to make up for that.
I figured I could handle the priming power of my Kronos with a K26 installed, but even if I could, this grip makes it 10x easier. It has a fairly simple installation and feels very slick on your blaster. I love how easily and quickly I am able to prime my Kronos in the heat of the moment now, which makes it worth the price.
Amazing product but like most, I would not recommend for the newer Kronos repaints. The amount of shell cutting is easy to do but must the T- pull very unstable.
I didn't get to use it because like someone said below it will not work for the new "Kronos" XVIII-500 I have blue edition. I took it apart and it's just to tight and even if you could squeeze it in it will stress out the plastic too much and cause it to break. The overall construction is 5/5 and looks great just wish I would have known before hand it wouldn't fit the newer. Rival XVIII-500
I currently have this in my Kronos with a k25 spring and it helps the prime a lot. I went from one round every two seconds with top prime and now I can do about two rounds every second.