WRT lubing a semi. If you use regular gun oil (even sparingly) or no oil at all, you will get powder residue caked all over the inside of the action. It will jam up. The best thing I've found for lubing rimfire semis is BreakFree CLP. It does not cook off and it removes carbon deposits effortlessly. It will keep a semi running trouble free. You have to see it to believe how well it works.