I bought a Ruger Blackhawk 3 screw at the gunshow today and it has a instinctive rear sight meaning filled in for quick draw. I am supposing by factory b/c only a few people can do this type of work and make it fit this good. It has a bead front sight and the caliber is 357. the frame, reciever and ejector housing are nickel but the cylinder and barrel are blue, I can tell this is the original barrel mainly because the insignia is on the reciever and not on the barrel, the barrel reads sturm and ruger southport conn. If anyone can tell me something about this it would be excellent. Thanks.