UNSA Model 194X "Peacemaker" Smokeless Rocket Launcher
At the end of the day, infantry need a way to deal with armored vehicles, whether it be tanks, APCs, or something more exotic.
The Peacemaker is a levisteel tube that fires off 100mm "rockets" (the warhead sits outside the tube) propelled by a gravite rod and kept on a flat trajectory by a gravite plate powered by a separate battery; the "rocket" has a marking on top as well as a ridge that slides into a groove inside the tube to ensure it doesn't get put in upside down. The flat trajectory means it can be accurately fired against stationary targets out to 900m with its simple optic. Now, with its mediocre speed non-stationary targets make things a bit trickier, but as long as the target's very slow or unmaneuverable it shouldn't dampen range much at all. Now we have good reason to select the gravite rod for propulsion, no backblast to limit where you can fire it, no trail to give away your position, and no noise. The primary warhead type is a shaped charge able to penetrate 250mm RHA equivalent flat on. The secondary meanwhile is solid HE in the same shell with a light frag belt made for infantry, bunkers, and vehicles too unarmored to be worth using HEAT on. The troops need to carry the ammo somehow, so it comes with a carrying backpack lined with thin sheets of specially shaped levisteel to reduce gravity's pull on it, allowing the AT trooper and assistant to lug these with relative ease. Thus, the Peacemaker can easily be integrated directly into squads as well as used in dedicated tank hunter units.