Re: White lightnin liner
You can't go wrong with WL liner. If you are installing on a rifle that already has a liner, check the threads as the WL has a rather unique thread pitch, as someone else mentioned.
Also, this part is critical. Once the WL is installed and filed flush, you cannot adjust it as there is no screw driver slot. It must be tightened properly when installed and you only get one shot once it is cut and filed. The key to making it fit properly is the countersink bevel that you must put on the hole before the linger is screwed in. The bevel forms the bearing surface that the tapered outter edge of the WL liner will snug up tight against. If you don't make this bevel deep enough, there won't be enough bearing surface and the threads may strip when you tighten it, and it may not file flush. But if you make this bevel too deep, the liner will screw in too far and again will not be flush. It sounds daunting but its not hard. I just installed one for the first time a few weeks ago and I got it perfectly without a whole lot of effort. The key is to countersink the bevel very gradually, screw in the liner to check, then repeat.
I believe Track of the Wolf has instructions available, and you can also contact Jim Chambers directly. I called JC and talked to Barbie about a question or too, and she was very helpful.
Use vice grips to tighten the liner very snug. I tightened mine just until the jaws of the vice grip started to slip. I don't know if it's possible to apply enough torque with the vice grips to strip the threads if the bevel is done correctly, so you might want to be mindful of that. On the other hand, that's a good question for Jim Chambers.
Lastly, when you file the liner flush, there is a good chance you will scrape the finish on the barrel. They say it can be filed down without affecting the finish, but that probably requires a lot more experience with the file than most of us have. I installed mine on an unfinished barrel, and did my draw filing, sanding, and cold bluing after the liner was in. If you are planning to refinish the barrel, then of course this doesn't apply.
This sounds like a lot of effort, but it is well worth it. Everyone I know who used WL liners swears by them.