Honestly, I hate the Ray Gun and any form of it. Haha. That's probably really stupid sounding, but I kinda feel like it's just retarded. Im definitely good at aiming, so I usually never kill myself when the time comes of being too close, but when it DOES happen, ugh. It's like death to me; literally.
But my combination is usually the "Healer Class", as I call it. Which is the PPSH[Reaper] and either the Wunderwaffe[DG-2? Upgraded name] or the MG42[upgraded Name]. I haven't played in forever so the names escape me. Along with that I usually only go for Juggy and Quick Revive.
My teams usually suck when it comes to having a plan and spraying, so when we camp on the catwalk I stay in the back and am the backup shooter for when: they run out of ammo, I kill through the window to lower the number they have, distract out the window with my Monkeys so we have time to all reload and such, shoot the Hell Hounds when they are coming to the stairs with the Waffe, and am the general Pick Up/Healer when everyone starts goin down.
Monkeys + quick spray with the Reaper + Quick Revive = Revive everyone and reload + Monkey Explosion x Waffe afterspray = Genius.