"Concept behind these is the less bb's it holds, the more accurate it is. the more bb's sacrifices accuracy. 18 is plenty for me. First off, this thing has a nice weight to it. On one hand it's realistic, on the other hand the nade launcher and nade made my full metal R36KE super front heavy. The nade itself works great. Thing to note, NEVER UNSCREW IT. lubing it up before your first use, and every dozen or so shots wouldn't hurt. Only real complaint, is how much of a pain it is to reload. Basically every tube is maybe 2 inches long. 3 bb's =about 3/4 of an inch in length. So you need to put the bb's in, and shove them down with a stick of some sort. If you put in too many bb's, the extra's simply slide out. if you put three in without shoving them down, they also fall out, they have to get passed the o-ring (the object that holds them past that point) firing it is fun. nice semi-loud bang, bit of recoil, etc."