WORKER18KG Upgrade Spring Silver for Nerf Rival Kronos (XVIII-500)

Works perfect with the ZWQ s200s. Draw weight is manageable. Probably not for children.

First off, those who say it doesn’t fit; you all need to learn how to modify your blasters. That or just stop, because obviously you are going to hurt yourselves.Upgrading the spring does take a lot of work but it does fit. You need to manually prime the spring and lock it in place outside of the blaster. For a good guide, look up Captain Xavier’s videos on how to put a Kronos back together.The people who say it is hard to prime are correct. The 18kg spring is harder to prime than the venerable k25 spring. You also get higher FPS as a result. That said, to prime this sucker, you are going to want to install a T-bar. While Worker sells an aluminum one, i recommend the 3D printed one made by SMEnterprises on Etsy. No shell cutting requires (unlike the Worker brand) and it is sturdy enough to prime the blaster.Expect ranges up to 165 FPS with this spring.

Product does as advertised and replaces stock spring, but then becomes nearly impossible to prime. Bought this to revive a blaster with a weak spring, ended up going with a stock spring and spacer. YMMV

Put it in my nerf kronos and it shoots a distance of 35-40 meters.

I got the spring to fit in the kronos but it takes an incredible amount of force to prime the blaster back now since the spring was a bit too long. You will probably have to cut it down and crimp it if you get it.

SCAMMMMMDo not buy this spring. It WILL NOT FIT THE KRONOS. I repeat, this spring will not work. Look at the picture. The one on the right is the stock Kronos spring. The one on the left is what they sent me. Common sense will tell you that a longer and beefier spring will not work in this nerf gun. Do your research on spring size and spring rates. I didnt, and now I'm pissed writing a Amazon review. This was a complete waste of money. Even more so cause i bought 2 to do both my Deadpool Kronos. id stay away from this seller all together when it comes to nerf stuff people. Straight scamming out here. This isn't the only spring they sell and apparently none of them are the right size. Read the reviews...

This spring performs exactly how you’d hope it would. And yes… it makes it much more difficult to prime. Enough that you could safely consider the blaster child-proofed after installed. 😂😂😂

Spring was as advertised and works perfectly in my Nerf Rival Kronos (Amazon-Exclusive) gun. Didn’t come with instructions but there are YouTube videos on how to tear down and reassemble a Kronos. Now that it’s assembled I have a distinct advantage at my work Nerf battles!