Although I don't own a Federal barrel, lots of good posts are evident on Glocktalk, regarding their use in Glocks. Call JR, at Lonewolf Distributors. He's great to work with, and if you don't like the barrel, he'll make it good. Bar-Sto probably is the best. It's probably also not just going to drop in and you'll have a pretty long wait, unless you order one from Brownell's or somebody else who stocks 'em.