It looks like AEoD. :/ Lots of resources that don't mesh together very well at all. Super amazing looking smoke and explosion effects and weapons with totally different art styles from gun-to-gun (also addressing model rips, on that subject). It looks entertaining, but none of the resources really go with each other.
I'm also personally not really a fan of using modern weapons and stuff like that in Heretic, but it's awesome that other people that do enjoy it can do so with little hassle. I don't recall seeing such a feature very often in other mods of this type.
One last note:
Did you happen to get this from RTC-3057? I believe said mod does not allow reuse of any
of its assets. It might be good to replace these sprites with other substitutes if that is indeed the case.