This weapon has not seen much development over the time it has been in the game, but it would be nice if it had at lest some variation in the ammunition types. Just how good would it be if you could fire an illumination round what would show light over a greater area, and also maybe a canister round to act as a large shotgun for close range engagements. Also there was a time when there was a stun grenade round, which came in handy to subdue aliens in closed rooms, and lets not forget the humble smoke, and HE rounds. There could be advancements in ammunition capacity, and range, plus add-ons for targeting, be it optical or digital, who wouldn't like some nice laser sights.
Just a thought, what do other think???