Curlys Airsoft shows you how to make your own airsoft hand grenade in this video... "This is my how to video for the Mk-7 BFG. I searched far and wide for a good DIY video for a decent airsoft grenade and when I came up short I felt like I needed to make one so here it is. I do sell them and encourage people to buy one over making your own because it helps me continue to experiment and improve on the design. I also know there are other people out there like me that prefer making our own stuff over buying it and didnt want to make them go through the hassle of trying to figure out what I already have."