sneakypenguin said:
But it's still limited in application then there was the issue of a shell that small being useful, air burst test where not superb and penetration of armor was pretty much identical to the 40. Geez I forgot what gun we are talking about,( XM8?) or that goofy one with the integrated 6(or so) shot grenade launcher.(xm29) if it's the later then as a standard issue rifle its a bit too much of jack of all trades master of none. not to mention a bit on the heavy side.
Talking about the grenade itself. I still think it would be a useful armament to have, even if you are right and it becomes a niche grenade it still will likely have a place. If for nothing more then the fact a smaller calibre would allow a larger amount of grenades to be carried then current undercarriage systems allow. The fact you can just fire it towards the enemy without worrying about ballistic fire path all that much is still a nice feature.
Now if metal storm designed a weapon system around it.... Three barrels taking up a little more room then the standard 40mm barrel but holding maybe 12 grenades within that could be fired in rapid procession. That could have a use on the battle field, to lay down a fairly impressive 'kill zone' of explosive noise, shock waves and deadly fragments. As an 'oh shit' weapon it would be devastating. Weight might be a problem in such a design though and while I ponder if it could replace the shotgun, in the same way shrapnel replaced canister shot, I do have doubts it would be an effective 'stand alone' weapon system.
Maybe that is why I want to see it incorporate with a standard rifle, cause by itself it really doesn't offer much more advantage then other grenade launchers on the market, some of which are effective as machine guns! Just hurling grenades instead of bullets. It would have to be a 'option B' system, for when you need fast firing explosive power to just bath a whole area prior to entry or to cover a retreat.
But your right... weight will be an issue with any such system, particularly a tri-barrelled MS system.