I have a Super Blackhawk that was sent to Magnaport for the Stalker enhancements
From their website
The Ruger Super Blackhawk Stalker and Freedom Arms
Using your 10 ½" Super Black Hawk or .454 Casull. . Cut and Crown Barrel to 8 3/8", Mag-Na-Port Process, Action Job, Inverted Muzzle Crown, Three-Ring Mount and Base, Velvet Hone Finish, Polished Hammer and Trigger, Sling, Swivels and Studs . . P.O.R.
All Stalker Conversions include etching of "Mag-Na-Port Custom" on the gun.