Who made the barrel?

[Red Devel]

HI this is reddevel a new member I have found the first item on my bucket list its a M1 S.A.Garand 6 digits Aug 1942 Ser# 798050 it saw service in WW11 and korea I have had local Gunsmith put it back in firing order and cant wait to get to our local range and put a few clips through it . Barrel markings are D6535448 (F) 4-56 -AY-PM it Has a bright chamber not parkerized with reimport markings from Korea ARL ORD Arlington Va lightly struck even my local gunsmith could not tell for sure who made the barrel any ideas ? Thanks

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