A really nice spring that packs a punch and installs really easily. I used it in a Kronos I modded to shoot MXL and it works wonderfully. Will definitely be getting more for future projects.
These springs really transform these Rival Takedown's and Kronos's into powerhouses. I have bought so many and they are so cheap for what you are getting. Pretty easy installation, a bit harder of a prime, but the range is insane for something that isn't going to hurt very bad at that range. It's just paintball or airsoft for in your house! I wear eye protection when using these because they can hurt your sensitive seeing orbs. They can knock over things like decorations and once even a glass bowl on the table was pushed off and shattered on the floor, but if you put all the fragile things away they are perfectly safe. At close range, they do sting though, not too bad of course. I definitely recommend these if that wasn't clear enough yet.