Okay I am going to send my barrel off to get threaded. It's a Mcgowen 26" 300 win mag varmint contor should I have them cut it down at all or leave it at 26". What threading should I get? I was thinking 5/8x24 would be most appropriate but I just want to make sure. This is my first build so I would rather ask a dumb question then screw it up thanks guys.