FWIW: the M65-8 is a fixed sight k-frame and it's barrel forcing cone isn't flattened to accommodate the cylinder bushing . Earlier M65 models with threaded barrels have forcing cones that are flattened at the 6:00 position. The 65-8's have the 2-piece barrel design and they appear to have a smaller forcing cone OD than the threaded barrel editions. I believe that a few M65-8 barrels got launched on some LEO guns. I'm not sure if the 2-piece barrel design is still in production on the M65's. Heck, I'm not even sure if they're still making M65's; they're not listed in S&W's 2011 catalog. -S2