At your service.
FLAAAMEEE WAAAARS!
But now on a more serious note... as we will have procedurally generated weapons, the differences will be a lot more subtle, than broad comparison between M16 / AK families. Think differences between AK(47), AKM, AKSU, AK-74, AK-101, AKSU-74, AK-103 - XM-177E3, M4, M4A1, M16A1, M16A2, M16A4, AR-15, CAR-15, C7... etc. etc. The differences between those are slightly more than superficial.
Anyway, we're just trying to make a point here, that a notion of 'longsword' in historical context of weapons used as base for weapons present in Exanima refers to a sword designed to be used with two hands on the hilt and not a popular notion which designates a single-handed sword with longer-than-usual blade.
It's complicated and rather obscure, but there it is.
NB: Longsword doesn't always cut. Examples: estoc, tuck, koncerz.