Problem with Part 3 is that when I got the breech plug to seal up with the breech, the flats lined up perfectly. Got lucky but it kind of messes up the video. Way to do it is to slowly file the plug or the barrel shorter. File whichever one is long. Get that to seal up tight. If you need to turn it a little more to line up the flats, file a small amount off the breech plug. That will make it too short. So file a tiny amount off the back of the barrel. Screw the breech plug in and check for a seal. It will turn a little bit more. Go back and forth filing tiny amounts from plug and the back of the barrel until flats line up and the plug seals up. It can take some time to get it just right. Breech plugs usually take some effort to screw in.
I suspect that Mr Kibler has put some effort into making sure that breech plug and barrel are cut to match as close as possible.to make the manufacturing easier. It will probably go in without much trouble.
Thanks Bill, your pistol video was very educational as all of your video's are. Watched your 4 Bore build parts 4 and 5 last night that was geared to installing/fitting a breech plug. Very good watch. Thanks for all you post. Hadn't seen all of your 4 Bore video's. Was going to tackle my SMR today but had to take one of our four footed man's best friend to the Vet this morning, then get meds for him at Vet's main office in Clear Lake, wife thought as long as we were in Mason City we needed to do some shopping. Nasty day up here in North Iowa. Snow/rain mix, blustery, chilly, and not fit for man or beast. Feels like nap time. You take care.
Edit: OK Bill, watched your Part 3 and without a doubt IMO besides your 4 Bore video's showing BP to barrel assembly/adjustment is the best and finest I've seen in the last several weeks of studying and reading on how to remove/install a BP. Alot of the video's showed some/explained some on how to do but didn't have the content and all of the fine points. Same thing with reading several paragraphs or so on many of the posts I've read (while informative and appreciative)), nothing like watching something on how to do with great explanation and instructions. Two thumbs up to ya, five stars, and an advance to the head of the lunch line. I feel more confident now and knowledgeable in doing my Kibler SMR BP change even though it will be nothing like taking a raw barrel and BP like you showed. Thank you much. CC