WORKER 18KG Upgrade Spring Silver for Nerf Rival Kronos (XVIII-500)

18 kg of power, this is a fantastic way of boosting your blaster it is definitely slightly longer than the stock spring. I read a bunch of reviews prior to this purchase saying that this spring is impossible to put in to this blaster. That is not the actual deal behind that You just have to be very careful and have the time and patience and the skill to compress that spring before reinserting it back into the blaster. Definitely need to be on a solid table plunger side down spring on top and have considerable weight to lock it into place. That being said you should have some knowledge on how to break down any particular item that you're working with. I would suggest to people that who are doing so don't let anybody that is not experienced to be working or replacing a spring that heavy. This is not something for children to try with their parents if anything keep them out of distance because that spring definitely has some built up kinetic energy when compressing. I would also suggest not to let any children play with this blaster after installing that particular spring. It is also harder to prime which is not a bad thing. Kind of makes it even more child proof then before. There is definitely a considerable difference. It has such great knockdown power that when I say knock down power there was a difference of sound and impact when I had used it at the same footage that I did with the stock spring from a light tap sound on the wall to a heavy loud thud sound. I wish I had made a video for this that would have been totally impressive to show that you can use that spring in a Kronos blaster. You do not need to make any cuts you just need to have time patience and some weight behind it and not be afraid to be hit by a spring if it does get released because it is a possibility that if you do not correctly handle the spring while pre-priming it before putting it back into the blaster it can rock you a little bit and not being said I've worked around spring before and it can rock you and take you to the hospital. But I'm not here to just diss encourage anybody but to encourage doing so buy using some common sense and some safety glasses.

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

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

Simple upgrade! Takes a bit of effort of force to prime when reassembling (recommend having a hard, flat surface). Even though this is a strong prime (even for adults), recommend you getting a priming handle as part of this upgrade.

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.

Turned out to be slightly longer than expected, but I was able to modify it to suit. The metal is very high quality and has kept its tension well even after heavy use. Would definitely get this one again for a similar project.

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...

great

Works well - not recommended for younger kids as it hits pretty hard.

The spring is designed to be longer as it retracts and causes more tension = more power

I like another reviewer did not analyse the details of the spring, and I did not measure the spring from my Kronos before ordering. It doesn't fit! (See the pictures, it is the one on the right) and isn't an exact match for diameter either. Stay away folks.