An unloaded XM5 rifle is two pounds heavier than an unloaded M4. But the XM250 is four pounds lighter than the M249 SAW.
The Army is slated to pick the actual weapon in the coming months.
The study is expected to take until fall 2023 but could result in a whole new weapon, caliber combo.
Three companies should be selected to build prototypes by the end of the summer.