In a recent thread (which I can't find right now) a member brought up a black oxide coating for stainless steel. It is made by Caswell, Inc. Works like cold blue only for stainless. I ordered a bottle and it came today. I blued the exposed part of the stainless barrel on my RRA midlength. The stuff works great, deep blue-black color, no streaking, well worth a look if you don't like the look of bare stainless barrels.