AoE Deluxe Bumblebee arm upgrade/mod using a spare gun loaned from AoE Deluxe Crosshairs. Really simple - remove extra gun from Crosshairs' trenchcoat. Next, remove Bumblebee's missile. Then, insert the gun into the missile holder. Finally, enjoy the way he looks and either leave it as it is or touch up the gun to match Bumblebee.