There is projectile swaps
here is a list:
brute shot-masterchief
plasma pistol-plasma grenade
brute plasma rifle-airsrike wraith shots
sentinel beam-wraith shots
smg-carbine shots
battle rifle-airstrike brute shots
magnum-beam rifle shots
there might be more not sure
There is a jackal shield,fuel rod cannon, and gravity throne and they all work.
There are also a few shader swaps
here are some pics thanks to treetoad:











credits:
Farklem for dothalo
the makers of entity
the makers of insolence
treetoad for pics