I got the Safariland 6378-383-411 and after heating it up a bit and putting a few sheets of paper under the trigger guard I was getting a smooth draw. One other thing was to remove the leather from just the top where the front sight caught a little when the glue from the leather gave a little. I like the style of the holster and well worth a little extra fitting to have a holster. I don't have my RMR sigh yet so I haven't cut into the holster yet but I think a dremel and a cut blade will do fine to make room and do away with the locking mechanism.