on my chronobarrel (this is not the best chronograph) my stock retaliator shot about 68 fps. after install my retaliator shot 115fps with full length adventure force and 120 with full length elites. the takeaway is a great performance improvement. Top hand priming has gotten noticeably harder and would be difficult for kids. I plan to get a pump grip to make it easier. there aren't any instructions with the product but you can find them on worker's website: https://www.workermod.com/2020/02/26/how-to-install-the-worker-mod-7kg-modification-upgrade-spring-sets-for-nerf-n-strike-elite-retaliator/
Order still dont recieved
15days and nothing!
This was used for a stock retaliator with full-length darts. So far it has been fantastic, as I'm reaching a constant 130 fps with elite darts. recommend leaving out the sliding lock and the trigger lock out after installing the kit as they were causing me problems with priming.