M17 Life Guestimation - right track?

[baconslayer]

Hi all, This weekend I picked up a bubba'd M1917 Eddystone. After some initial research I wanted to put forth a guestimation of its life. Bubba mods= cut down stock, retains both sights.

The serial number refers to an April 1918 rifle manufacture.

The barrel is dated 12-17 ; W for Winchester.

Bolt is mix of R, E and W.

The barrel and action are parkerized in a well done black/dark grey.

The bore measures .3005 at the muzzle with erosion tool gauge.

Markings: Left side: AAB, AABG, RA ; H by mag well ; Square P and Fancy P behind Trigger guard

further research: AA= Augusta Arsenal used 2, 3, 4, and 5 letters. Examples include but are not limited to AA, AN, AAL, AAM, AAR, AOY, and AAHO.

My assumption:
Made in 1917 - did some sort of service WWI era, Training, etc...
Put in storage
Pulled out in WWII
Determined damaged bore / barrel, replaced with the Winchester then parkerized
Sold to public, bubba'd and rarely shot

Thoughts? I am mostly questioning the arsenal install of W barrel and parkerization.

Thanks!