Sorry but i don't like the Golden Mauser, i don't know, why, i just don't like it.
Probably cause it sucks. But you can get more credits if you kill someone with it. And I wouldn't use it campaign-wise, it's not going to be useful. Really though I wouldn't use it at all unless you want to mess around cause you're bored.
Pistol: The Ripper, for its shotgun-like qualities. Sidearm: The magnum, because I can snipe without a sniper. C. Range: The Terminator. It makes me feel powerful and range-y at the same time! Auto: The standard AR or the AB. Mostly the AB for its fire and bouncy stuff combo. L. Range: The standard .50 cal! It has EXTREME headshot damage and I use that to my advantage. Heavy: Anything but the Focus Beam. That thing is kinda useless because I get killed before I can use it effectively. Explosives: The Ice Hunter, mostly for its rapid fire with the Hair Trigger upgrade, and especially when I have the rapid-fire bonus. So fun.
holy grail is good. but for one shot, its not worth it. electro bolt is really good
I bought the electro bolt because I thought: If the holy grail's this good, think of how good the electro bolt will be! Then I bought it and it sucked. The same thing happened to me when I bought acid hound.