06-19-2014, 02:14 AM
It is 1.3" in inside diameter. Mine has an actual diameter of 1.350", but there is also the tunnel on the top for the gas tube that adds another .375" in height for a total of 1.725". I was trying to find out the bottom thickness of the gas block. I have .262" between the bottom of the .750" barrel and the BCM Handgaurd. Doing the math from the JP web site and the .408" measurement from this forum the bottom measurement should be .250". That make for a close fit. Just trying to see if someone has put the two together yet.