>>6018509The little c-clip male piece can be plugged either sides of the rifle.
You can unplug the skirt booster of Gundam Astaroth and plug in the attachment parts to the rifle. You can also sorta just use the monopod to support the rifle if you don't wanna detach the skirt armor. I found that you can attach the rifle directly onto Astaroth Origin's skirt armor.
