Can't identify it and really doubt it could be something else than a heavy (and amateurish) customization, or even a mash-up. Many details look weird: /R top left corner (serif removed?), /R leg (which looks to have been added to a a /P actually), weird /s and /r among the orthers...
Some alternatives but far from being even loosely similar: Terital United, Deftone Stylus, Wisdom Script, Duvall

Thanks Ryuk!

I thought it might have been a mash-up as you say because the /s/ looks out of place and the /R looks really awkward.