The XM25 had to be carried like a rifle, which meant it was difficult to bring along an M4 too. This was why lighter shoulder-carried rocket launchers are popular, such as the AT-4 and the M72 LAW ...
This increment produced the XM8. Increment Two focused on refining the 20mm airburst grenade launcher. Result, the XM25.
The XM25 Counter Defilade Target Engagement System enables the small unit and individual soldier to engage defilade targets by providing a 25mm air bursting capability in all operational environments.