A post-apocalyptic world should be littered with Kalashnikov and m16 rifles. There are probably close to 100 million of these things in existence now. God knows many other hand guns and rifles there are.
Whatís the plan for ranged weapons such as guns or even crossbows? I donít know if sitting on a hill with a 50cal sniper rifle and a Glock G22 back-up would fit well in the game but would be somewhat historically accurate.