Depending on the character concept, most characters would probably use an assault rifle, unless the requirements of the group placed them in support weapon duty. A more sniper-style inclined character would most probably use a 7.62 or .338LM sniper rifle as primary with a smg, pdw or a pisto, as a secondary. And should the nation of origin be using M203 or similar system, shotgun can easily be replaced by an APERS round (a canister round, similar but larger than a single shell from a shotgun).
