Before I start,I want to make it crystal clear that I know some of the weapons are already unbalanced or just plain useless,but sorry if I want to see something new implemented.
Here it goes:
A new small gun assault rifle with medium/small range (less then an assault rifle)
Not very useful from afar but at closer ranges it can hit pretty good,1hexing for example would be one of it's stronger uses.
This might give some chances and uses for two handed SGs in PvP other then crippling.
Also no need for a new sprite or anything(inventory or otherwise)

The Fallout:Tactics AK47
edit: also 5mm ammo for it