The Black Ops mod adds SSG to Doom 1

[BigDickBzzrak]

Just what the title says. It also plays the death sound when you stop plasma gun fire.
It doesn't do any of these in Doom Retro.
(my Eternity version is 3.40.46)
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In case you don't know, Black Ops is a mod that makes weapons fire really smooth. It can be found in the signature of one member here, I think his name was VGA.