Realistic Weapons gives weapons their realistic range and muzzle velocity, as well as making the weapons behave more like their real life counter parts. This mod has a stand-alone version as well as a Project Armory Compatible version.
Pistols and SMGs have a very short range, as well as a lower damage, but their aim time is significantly faster than rifles, and most have a higher fire rate than rifles, making them the best choice for close quarter fights