Most bad ass high rof sound effect?

Im in the process of making a mod for System Shock 2.

Question: what is the most bad ass machine gun sound effect you've heard with a high rof?.

Ideally it should be related to larger caliber weapons like mg42 or miniguns not submachine guns. It will be added after all to a large assault robot.

grab yourself some sound effect cd's (like warner bros sound collection).

playing around with even a jackhammer soundclip in an audio editor can make a convincing machine gun sound.

Thx m8, most useful reply Ive had so far whenever I asked this question.