Couple of options drill the chamber and weld the barrel into the receiver underneath, smooth out the damage cold blue it, weld up the firing pin hole cut a slot under the barrel out of sight and have it in the man cave or strip it down pull the barrel and put a drop saw through the receiver part it out or keep the spares for your replacement carbine. Ensure you destroy the receiver either way so it can never fire a round again..... just my 3c worth.