XM25

I saw some hint of this or another similar weapon last year some time.

It is a repeating grenade launcher. There must be dozens of kinds of ammo for it. It is small, and handy. The shells can be set to go exactly X far and then go off, or go off a couple meters after hitting something (inside the room on the other side of a wall or window). Nice idea. Very Starship Troupers. I like it. I swear I came up with Starship Troupers before I saw the same comparison in one of the articles below.)

Another potential replacement for the M-16/M-4.

After nearly a decade in the shadows - with billions spent on earlier versions long since abandoned - the Army is hurtling along to field a revolutionary new weapon to Joes a lot sooner than anyone had ever imagined. It's a weapon that can take out a bad guy behind a wall, beyond a hill or below a trench, more accurately and with less collateral damage than anything on the battlefield today, officials say. It's called the XM25 Individual Air Burst Weapon, and by next month the service will have three prototypes of the precision-guided 25mm rifle ready for testing. ... "What we're talking about is a true 'leap ahead' in lethality, here. This is a huge step," Audette added during a phone interview with Military.com from his office at Picatinny Arsenal in New Jersey. Defense Tech (quote)

Link

Here is a scenario that runs through my head. Bad guys firing on a convoy from a building. Fire a grenade through each window without even considering which the shooters might be behind. Then going on about your day.

Night patrol stumbling on a convoy of enemy moving from one hide out to another. Don't bother Who needs an air strike. Just crack a couple rounds over that way and fill in the report.

As soon as they increase the effective range beyond a kilometer or so, snipers will clean up entire platoons at an outing.

The secret is in the site and computer that talks to the round before it fires. Sets range and whatever else is settable. I read somewhere that a computer in a site would calculate a range and correction for moving targets and produce a synthetic target for the shooter to aim at when they pull the trigger. The XM25 would benefit greatly from this if it exists. Just a suggestion.