>>63982751On paper it's the best light at in infantry favored terrain(close range), everyone can use and carry a lot of, fire from any angle with low signal but there is a lot of fiddling, one of which directly kills you. It is already at the limit of acceptable recoil to develop more velocity. the range also limits how much mutual support it can give.
Insert grenade, gas block off for the semi auto, fuse unpin, and cock and chamber a blank either stored in the tube or comes in separate clip/mag if no bullet trap. Cock the gun again for second round.
Anything that simplify it comes with some non-standard adaptor gadget and gun parts.
Germany had the spin stabilized one with shooting cup which has its quirks.
40mm rifle grenades are nicer faster and more accurate but it's half the payload.
Personally I think rifle grenade should be carried by every rifleman so that they can project HE, smoke, illumination and what have you like rope for communication or hanging weight, lead weighted nets for drones. The fiddling can be reduced to 40mm level by using the bullet trap, a tab at the gun barrel muzzle to block gas when inserted, or the gun would naturally block gas when seeing sustained pressure more than what's needed to cycle, and fuse set to ready by sustained gas pressure in the stem. The same warhead can be modular for drone use.