I've acquired 2 1919 kits from two different individuals which I am getting ready to build. Reading diligently on this site, I am keen to the issue of proper head space and the cautions of using improper ammo so I'm a bit concerned in regards to chambering and what these kits are really chambered for. The parts in both kits are all stamped 7.62 including the barrels. One kit, which came in an Ohio Ordinance Works box, has "308" written on the barrel with a black magic marker but I see no machining or grinding on the end of the barrel to indicate any modification. When I measure the depth of the chamber from the face of the barrel to the beginning of the first taper, I measure about 1.438" deep on both kit's barrels. I am using a depth micrometer so it's not a perfect measurement as it's easy to slide up the taper with my measurement device. But, I'm pretty certain they are both the same. I've also read about 7.62 NATO versus .308 and have seen all the good tutorials for what can happen if I use the wrong ammo. Can anyone tell me if this is the proper chamber depth for 7.62 NATO or is there a better way to measure/verify the chambering without making a mold of the chamber?