Reciever is Remington S/N: 3886xxx (from CMPicon)
Oringinal barrel was Remington 4 groove June of 1943
New barrel is Remington 2 groove July of 1943 (from Sarco)
Underneath the bold handle there is an "R" so I guess it is Remington it looks pretty worn but doesn't look like an excessive amout. The sides of the bolt's lugs are worn down shiny but teh back of the lungs don't look worn. (I would think it would be the back of the lugs where you might loose material and then headspacing would open up?

What do I know.. Next Sunday I will be in the country and be able to test it. I will have a full report after that. Would it be of any use to measure the brass before hand and then after? Of course if it is accurant enough who really cares. I would be happy with 3 MOA.