Remix (MP3) with original hissy "gas-leak" equalisation. Sounds much better when downloaded: without the compression artifacts which can be heard ...
Its a shotgun blast with no pumps or anything extra.
Stereotypical warped-record "madness" effect with mental-institution reverb. A sample request ... http://www.freesound.org/forum/viewtopic.php?p=20719#20719
ambient sound effect created to give the idea of hell for a play. Hope this is useful