Interesting point, and it seems right as regards to 7.62mm, but even I don't see a necessity to diversify SMGs (although a change in range 10 vs 8 hexes might be reasonable in case of short rifles - under 600 mm barrel ...just thinking).
If you like diversifying infantry weapons, you may want to join SP:WAW ENH-FR team
https://www.tapatalk.com/groups/spwa...=unread#unread