There's also an «S» that acts as the extra special weapon pickup. (hardcoregaming101.net)
That, coupled with some bizarre weapon pickups serve to make this title a bit of a frustrating mess at times. (brutalgamer.com)
I suppose the gatling gun is the starting weapon and has infinite ammo, but there are plenty of weapon pickups you can find to get your hands on better weapons. (monstervine.com)