OH MY GOD. Yeah, okay. That's borderline cursed. I see why he tilts the pistol.
As for Gearbox, I checked it with all four weapons, turns out that it MOSTLY works:
Honestly, this one's actually playable. However... Here's GMOTA as the Doomslayer.
...Yeah. See the issue? Also in GMOTA, the Blazter's icon is a sprite of a dead Doomguy marine, as does the Vulture SMG in Combined Arms. Speaking of that mod, all the Crate Weapons render fine, but Tech-Monk's equipment appears like the Deriver's pistol up there, and as for Blastmaster...
...Yeah. Sorry if this is a bit overwhelming -I do genuinely like the ideas you come up with. It's just really annoying how it doesn't quite work with Gearbox, since I use it with basically everything. I just prefer it to the mouse wheel...