Talked to Ruger customer service today and confirmed that yes all M77/22’s have gone to a threaded barrel to receiver fit. they no longer will use the V-Block method. I then asked if the 10/22’s were going to that design to and the lady said at this time she had not heard anything on that but would look into it for me and get back to me. I asked how we as consumers would be able to tell if the rifle was old style with v-block or new style with threaded barrel and she was going to get the serial # of the transition for me to post. I then told her that I can not believe that something this drastic in design change was not posted on their web site as News!. she agreed and said she would look into it.