Rick, that is a reclaimed Ruger 3 screw. I found the handgun in a pawnshop and the inside of the barrel and cylinder were badly pitted from using black powder and not doing a proper cleaning. I got it cheap ($120.00) due to the damage. I sent it to Ruger for a new barrel and cylinder and a reblue. I added a steel ejector rod housing and a stainless steel grip frame from a Ruger Old Army. The horn grips I got in a trade with Doc O'Meara. The caliber is the original 357 Magnum, which believe it or not, I prefer to a 44 Special. Ruger did convert it, but sent the original parts back and I reinstalled them and did a trigger job in my shop. It is a very good shooting and handling handgun.