Originally Posted by Iraqgunz

Here is my suggestion. Go to billricca.com. He has original Mil issue FIELD headspace gages. That's all I use when I build AR's. I think it's around 30.00 and I believe he is in PA.

Checking the headspace is easy. With a clean weapon, insert the gage into the chamber and then ease the bolt carrier into place and attempt to close using light finger pressure. If the headspace is correct it should not close. That's all there is to it.