I would like to start out by saying that I enjoy the BR-16 and the Stark AR and they both are great weapons for Fire Supports, but it most cases one can see a theme on weapons.
While More long range oriented Fire Supports (Arty, Kira) have the Dreiss, Stark and the BR-16
Closer range Fire Supports (Skyhammer, Stoker) have the BR-16, M4A1 and Timik-47
In their order, the BR-16 is Stoker’s and Skyhammer long range rifle and Arty’s and Kira’s close range rifle
It seems a tad out of place for Fragger (and possibly Thunder) as he is meant to be a more close range oriented merc, if the BR-16 was swapped with the MK46 it’d serve more as a higher rate of fire lmg, with a high ammo capacity but same reload speed as the K-121 and low damage, serving as decent counterpart while the M4A1 serves more as Fragger’s more accurate weapon.
A small personal gripe about it as well is the that Fragger is still depicted holding it and Thunder the K-121.