When in a vehicle where your character doesn’t have any weapons.
I tried multiple vehicles and I think that glitch work on all vehicles (but it’s pointless with the Wraith) and it’s very easy…
You need 2 weapons and the one you want to see is the weapon in your back so you need the other one, okay now get ready to hop in a seat, press Y to change weapons and hop inside when the animation lower the weapon, you must be inside before you have the other weapon in your hands (no proper HUD) .
That’s all, if everything work the weapon appears at the correct location and once you get out of your vehicle, your character pull out the weapon.
I think that glitch is possible on Halo 4 or maybe any Halo after Halo 2.
I don’t have a picture either.
EDIT : seem that doesn’t work with Halo 3 (I tried on the Scorpion’s turret) .