Interesting that you are able to use the 100 SWC's in this bbl with such good results. Can you tell me what your "load" is for this bullet, COL, etc?. Are you getting reliable function and lock up? Did you "chrono" the loads?
LIke Tony says, STI refused to tell me what bbl they are using other than it is a 1:16 twist.No one else seems to know what they are either.Fairly sure made in Phillipines since their lower end guns made there, but could be in error. The one they replaced it with likes Winchester 115 JHP the most with 4.2 CFE powder, 1.142 COL so far. Cant load it down too much with the weight of slide will not function.You can see slide moving forward almost slow motion, and do clunk on lockup.Does lock up tight. HOw is trigger on yours? Mine breaks about 4.0 lbs no creep.
Just curious, sights appear to be Aristocrat, and wondering if your adjustment screws are metric or s.a.e.? Mine has metric,and Jim @ Aristocrat swears his only come with s.a.e. Had to have the front sight replaced for a higher one for neck shooting at 50. Stock sight could only shoot point at 50, this way it came.
BTW, like the furniture on yours. I picked up a nice set of Rosewood with finger groobs on Ebay made in Phillipines I think.