Archgun launcher?

[Spleega]

I finally got a gravmag and equipped it to my 'big soma' arch gun, but how to i equip it so that i can launch it from my 'q'? Been banging my head against a wall for 45 minutes trying to figure this out. Im probably just extraordinarily stupid but please just humor me

[Skoll-]

Go to your armory, go to change modes, select vehicle, and add it under your archwing. It's right above K-Drive selection.