Have you ever thought that Enter The Gungeon needed more death lasers?
Well this is the mod for you!

Adds a command, ( beholstermode ) that on enabling it, makes every enemy also be able to fire a Beholster beam.
Using the command again disables Beholster mode, however the player moust move to the next floor or reset the run to feel the effects immediately.

Is this beatable? Maybe.

Source Code here.