New to the forum. I have a 220 slug gun that I am going to re-barrel. I have the wrench and have done my 10ML2's to convert them to 45 cals, so the work is not an issue. I ordered a Shaw pre-fit to replace the factory barrel. Reason being you can actually see tooling marks on the lands at the muzzle. Has anybody else does this re-barrel? looks like you can rent the go/no-go gauge for about 10 bucks. Thanks.