After watching the videos I find the following;
1. 3 rounds loaded under carriage--slower load time if reload needed. Wouldn't a quick break down, or break open system as in shotguns or some styles of pistols be quicker? Thinking about it, probably not however, to side load or top load may be quicker and better.
2. The explosion seems to be significant and may be "all that."
3. Is the stock really necessary? What would happen if no stock were used?
Now for a different weapon choice. I watched an episode on futuristic military weapons which had a bullet which could penetrate into a wall and then explode within a room flinging many projectiles throughout a room which could take out a bunker easily. I even believe it could be programmed
(yes, you had to manually program where you wanted the bullet to explode) to do the same in an open field? It has been over a year and a half since I saw this episode so I may be a little sketchy, my point is that perhaps we may have more at our disposal for use by our troops than this simple 3 shot grenade launcher.
I did enjoy the videos though, thanks for the link.