I have a old nagant that I have decided I am going to sporterize I know some of you don't like the idea please don't be posting leave it stock because I am going to do it and you are just wasting your time I am wanting to cut the barrel to 16" thread it and add a muzzle brake I have heard a lot of talk about crowning the barrel to make sure it is straight and removing any burrs is there something special I need to do with this or can I just use a file I think I am making it more complicated than it has to be also threading the barrel for a muzzle brake is there anything special for that or someone on here close to central Indiana that could thread it cheap that's the one thing I'm the most worried about screwing up thanks for your info in advance