Here's the link: http://www.airsoftarms.com/MODIFY-Tremors-Recoil-System-for-M4-Carbine
I was just wanting to know if anyone has any kind of experience with one of these kits. I've watched the videos on youtube and read reviews. But most of them just say that it adds a slight vibration. I'm really looking for realism and if that's what takes for me to get back into AEGs, then I'll say that it's not a bad price to do so.