Quote Originally Posted by rob_s View Post
How did you get an AR15 LMT bolt? Did it come with the gun or you bought it separately.

The "F" may actually not be a mark as some don't mark them. what's more important is that it is the correct height. I'll make a change to the chart to be more clear when I repost it next.

The "F" should be in the forging. It is not marked later when machining.