Well, got out with the new addition to my M&P and it functioned 100% with everything we gave it, factory and reloads. At 25 yards getting about 3" and occasional flyers. At 50 keeping everything in 9-10-X ring with a 4.25" bbl. Not too bad for an old man with bad eyes. Cant say it shot like a high end 1911 though, but definitely saw improvement over the factory bbl. Not finished yet and going to do some more. 1:10 twist, seemed to like the HNDY XTP 115 grain bullets a lot with 5.5 grains of Vit 3N37 powder. Installing changed point of impact from old sight setting. Gunsmith version installed by a competent smitty might even do better. There is a 5" version of this bbl too. Should be great for IDPA, service, stock, match.