It would be difficult to convince the Order to use Muggle guns though. They, Draco anticipated as he tried to lurch quietly through the door having agreed to take point in their escape, would probably not consider using guns to be a good idea. It had taken a while to convince them to use the Kolokol-1, and flashbang grenades, and that had only been because getting the horcrux was so important to Voldemort's destruction. They would probably balk at the idea of shooting the Death Eaters as part of general warfare – never mind that they used fatal spells and curses on them; that didn't count somehow.