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.