I've got Birdsong's Black T on 2 and it is pretty awesome stuff. It penetrates the pores so even on spots where it starts to wear like around the muzzle, it is still completely rust proof. Never put oil on them and since it is self lubricating, they are very slick. Currently wait times are about 8 weeks and I am waiting on my 3rd rifle to come back from them. My smith sends them in after the metal work is done and includes the cost in his price. Thinking it is around $275 per rifle, but that includes every part of the gun getting coated. They also have a green version which I have to get someday. Good luck.