Thread: Headspace
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Old January 1, 2019, 04:43 PM   #34
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Join Date: April 10, 2008
Location: Alaska
Posts: 5,884
On the 1917 it was simply what they did. While 100 years old, the OEM barrels on the 0ones I have are new.

Keeping in mind the guns came out of E, R or W from a British design (Pattern 14) standpoint tech and they may have just followed that. I will have to check my JA barrel to see what its headspace is, I don't remember. Its a WWII 1903 barrel with 1917 thread and front sight base otherwise.

They followed the Brit 5 grove rifling as well as the twist direction. They did change the bore to match the US .308 standard though its a tad different on OEM due to the rifling type.
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