Many years ago a friend of mine that was in the Military gave me a set of 5.56 Nato Headspace gauges. One was labeled go and the other was labeled no-go. For the life if me I can't find them anywhere and it's not like me to loose tools! More than likely what happened is I let someone use them and they never came back. Anyhow, I own Headspace gauges (other than 5.56) from several manufactures but I wanted to get some opinions on brands of gauges from all of you. What are you using for 5.56 Nato? Thanks!