A few things.
1. Your sentence kinda just cut short so I'm curious where it's going.
2. I agree that sub-units should distinguish themselves, either by specialty weaponry and/or more focus on particular jobs. Unfortunately when it comes to weapons, there are some sub units that get favored more than others for things.
3. This is just a side note, but I've noticed a large increase in groups focusing on rescue/protection recently (104th/Dire - hostage/VIP rescue, Improcco - CSAR, CG/DS - VIP defense, Senate Commandos - VIP defense, BH - Guard Contracts), Even the gun you are suggesting was used particularly by Guards and Police.