Just got through with my first re-lining of a 22 rim fire barrel. It was on a Savage model 1914. First off, I have to say hats off to the folks at Brownells!! The instructions they send with the barrel liner, at no charge, is worth it's weight in .....!! The only thing I can caution on if somebody is going to try one. When you start drilling at the chamber end, pay attention, when you start, to the extractor cut in the existing barrel. If you have a large cut out, watch the bit and use a LOT of oil to keep from chipping the drill bit. Other than that, take your time and it is pretty straight forward from there. I will post some pics when I get everything blued.