I have the opportunity to buy an old Auto Ordnance 1911 that looks to be late WWII vintage or newer. The gun's barrel has a almond sized rust area just inside the chamber and barrel. Will this affect the functioning or safety of this piece? Can I just brass brush the area and clean it up? I can get it pretty reasonable, for a song really, but the owner is a little reluctant to hand the weapon over for field testing. I've had it apart and everthing else looks good. The thing rattles a little when shaking it, but seems to function normally. Ca'nt post pics right now, waddaya think, or ?