Just a though
On new weapons design
A motor you could use ether line of sight or a painter

And some one was wanting a new type of grenade
what if it used a new type of delivery system
I found this it for busting down door Its an explosive type thing but you could load any thing you want in it
and it has a short rang like a grenade
These would be all new to ballistics

120mm? Holy crap, that's the size of a tank shell. Plus the sabot designation (even though the other parts of it say it's a high explosive) make it basically a tank shell stuck onto a rifle barrel and fired using regular ammo.

Some RPGs have 105 mm warheads if i stand correctly.
The weapon is a FAMAS and I recognize the grenade that is very similar to the SIMON breaching grenade, I don't think the rifle grenade would be so heavy because if that's the case, the energy of a 5.56 mm ammo wouldn't be sufficient to propel an heavy mortar, but it can be 120 mm but the explosive charge isn't long it's wide.

The Frenches and some other nations uses rifle grenades instead of under barrel launchers, and some other countries uses both kind of launchers

There was a vid but I lost the link did not seem very heavy
The power was good for a grenade
took out door and frame it cement block building
The rang is about 30m

Been looking for stuff to make on pimp my gun and found
allot of weird delivery systems and weapons