Vern:
Apologies for the delay as I had to procure a digital caliper, which I'm sure will prove indespensible for these purposes.
I measured the distance from the bottom of the lug to the top of the receiver (24.6 mm in diagram) and read 24.66 on gun #628. The caliper also had a depth gauge on the end which I measured 2.3 mm on the height of the front of the lug. I compared with measuring a 1920 commercial with a stamp on lug and read 24.63 and 2.29 mm respectively. My tolerance with the caliper could be +/- .5 mm or so, but I'm fairly confident the lug on 628 has not been ground.
Here are the pictures requested of the front of the barrel. If you need one dead on straight let me know. I look forward to your comments as well as any others that care to chime in. Thanks again for your time.
Clark
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My militaria collection is dedicated to the memory of my Grandfather, Marine Gunnery Sergeant Dave Hill, Jr., wounded in action at The Assault of the Second Marine Division on Betio Island, Tarawa Atoll, 20-23 November, 1943. http://www.tarawa1943.com/pages/casualties%20tarawa.htm
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