Picture of Secretary of the Army Daniel Driscoll, in the green jacket, is shown, from left to right, mockups of the Northrop Grumman-Colt precision grenade launcher, the FN America PGS-001, and the Barrett/MARS SSRS. An M4 carbine and an M320 grenade launcher are also seen at right.
Picture source from the US Army.
So I'm just learning about this for the first time because I sorta just figured the military would have some semblance of Strategic common sense left in maintaining the 40mm under-barrel grenade launcher platform they've been using for decades.
Nope. Fuck that.
Apparently the DOD is looking into competing contracts for a 25mm semi-auto magazine-fed grenade launching man-portable shoulder-mounted rifle. They're estimated to only carry 5 rounds per mag, have whatever shitty computerized Optics they're gonna slap on their dogwater rifles, be used to shoot down drones, and have shotgun canister rounds for close quarter combat.
Thing is, it's gonna be fucking heavy, at roughly 14 pounds loaded unless they can shave off more weight. It's gonna decrease the infantry squad Firepower by at least two riflemen by making each fireteam's designated grenadier able to only shoot grenades and maybe a pistol sidearm if they're lucky.
They're not gonna carry the new fancylad XM7 Rifle because that's already like 10 pounds of shit as is plus ammo in addition to the proposed 14 pounds of shit grenade launcher rifle plus ammo, that's just too much shit to move with and just a fucking mess to deal with in general. If they get told they get to use the M4 carbine system as their primary carry, that's still around 7 pounds plus ammo of extra shit they gotta handle.
XM7 below
M4 below
The fucking Pentagon's brilliant thought leaders are already bickering over whether or not the new rifle carrying 10 less rounds is a good thing (more stopping power plus range per round) of a bad thing (less massed fire for suppression and less ammo capacity). Introducing what looks to be another fuck up to the standardized infantry squad loadout is sure to really hamstring the footsoldiers of the u.s military if they actually follow through with this.
Fuck me, the rational side of my brains looking at this pulling the hair out of its head but the sicko commie side is going 
I mean at the end of the day the primary objective of all of this crap is enriching defense stockholders, which is why it makes sense to pioneer an all new round with reliability issues rather than just use an already-existing and well-understood caliber. The fact that the brass tends to break into two pieces is icing on the cake because it means reloaded ammo absolutely can not be trusted so there'll be no competition from it when the design migrates to the civilian world.