Rifling can be done either by cutting the grooves in an already existing caliber size hole in the barrel -- cut rifled -- or it can be done by forcing a mandrel with the pattern of the rifling through a barrel, stretching the steel around the shape of the mandrel -- button rifled -- or it can be done by putting a mandrel in an oversize bored rifle and then hammering it to fit over the shape of the mandrel -- hammer forged.
Those are rough descriptions. The gun you are looking had the rifling made by cutting away some of the steel along the inside of the hole in the barrel.
I'm going to guess that stress relieved has to do with some kind of heat or other treatment applied to the metal in places where it was worked to allow the crystalline structure of the steel to realign itself into a "more comfortable" configuration on a submicroscopic scale.
__________________ Teach
Taxpayers voting for Obama are like chickens voting for Colonel Sanders.
On a sidenote..."Big Fing Revolver" has to be the best name for a firearm ever!
(if it doesn't really stand for that, don't tell me. I like my name better. LOL)
__________________ I'm here for a good time, to h*ll with the red wine, pour me some moonshine!
Teach
