Is anyone else bothered with what the HD weapons pack did with the SMG?

[Tazok]

I'm cool with the most of the HD weapons pack, but what they did with the SMG really bugs me. They changed the submachine gun to an automatic assault rifle, which are different types of weapons. An assault rifle should have better range, a little more power, and a smaller magazine. Additionally, the SMG and pistol share an ammo type which makes sense since the definition of an SMG is typically an automatic weapon that uses a pistol cartridge. But rifles have a different cartridge type (the bottom brass bit is thicker and tapers to the bullet that actually shoots) with more gunpowder for greater speed and thereby armor penetration. Are the weapons using a 22LR converter? Why is the military fighting with such a small calibre? (might explain why soldiers can take like over 10 gunshots)

[Cat]

It's called 9mm AR in the files before the HD exists so I guess this is what they were once planning for. I think it's based on a CQB carbine that uses the 9mm ammo, since the military are expecting to fight in indoor scenarios. I think a 9mm rifle with grenade launcher looks cooler than an SMG with grenade launcher.