Reverse engineering

It would be cool if when a creature gets a weapon that they can't normally make (shotgun, laser gun, evil + good mage staff) They could reverse engineer it and make it a mass-produced weapon, Here's an example:

Before a laser gun was reverse-engineered

After (They all have laser guns now)

This would be cool if you wanted more "modern" warfare where attacking armies have guns and stuff instead of swords and bows