Acraglas comes with a release agent...use it liberally on metal parts. And make sure to mix in saw dust to get the best stain match. It won't be perfect, but it will be better than just plain acraglas with stain over it. Also, you can send the barrel to Lodgewood Mfg. They can get rid of all those modern marks on the barrel. Saves you some elbow grease and its not expensive.