I waited a long time to find an FBI style Bucheimer holster, but recently was able to grab two. My patience paid off! One is the original 01-604-16; the other has an "F" on the end, designating this holster was made for a 1" belt. I couldn't wait to try my four three-inch K-Frames (Three M13s and One M10) out in these holsters! The M10 is the one with the Tyler T-Grip. For the M13s, two are Ahrends and one is the standard stock.