I would like to see Metal components be upgradable similar to Durable Cloth and Reinforced Leather. I think that the same way Durable Cloth can be put in for Cloth and Reinforced Leather can be put in for Leather, that anything that wants a Barrel should be able to receive a Marksman Barrel, anything that needs an Action should take a Refined Action, and anything that needs a Blade could take a Gilded Blade.
