I've had a 4" S&W 586 for several years that I installed Pachmayr Gripper grips on, and they fit absolutely perfectly. Well, a 6" 586 followed me home the other day, and I immediately went out & bought the same grips for it. What a disappointment! Sloppy fit, gaps where there shouldn't be gaps, excessive trimming required to remove material that shouldn't have made it past QC, etc. I called their headquarters, & they said to send them in & they would replace them, but should I expect anything different on the replacement set? I mean, the instructions actually included a number to call for problems with the fit, as if they almost expect there to be issues.