This shell is BOSS!!!!! the build quality is top notch, the power is amazing! This is designed to fire four .68 paintballs but I use it to propel NERF rockets and it works perfectly. It has not failed in the field and is by far the best shell out of the others I have from king arms and s-thunder. it is a bit costly but well worth it, in fact I will be purchasing two more as soon as budget allows.
Cost, but you get what you pay for.
Heavy, (not a con per say but when you're all geared up every bit counts)
Rating: [5 of 5 Stars!]