Been doing "all metal" builds since I made my Krag. Receiver was just modified: ejection port enlarged, stripper clip guide cut out, all with an angle grinder and dremel. Barrel bands are aluminum: cut out sheets, bent and brazed together. It's not all metal though hence the quotation marks like for example the trigger guard. The outer and inner surfaces of the trigger guard are flat sheets brazed to the bottom metal but the space in between is filled with marine epoxy. The bolt handle is fiberglass and marine epoxy with a steel bolt running through it.