With a thank you to Ron Wood for making this aquisition possible, here are pics of an excellent 1917 Artillery... but for the ground stock lug.
If it had a stock lug, it wouldn't be mine.
The sideplate seems very discolored compared to the rest of the gun.
It has what appears to be a WWII Mag, but the mag body is not marked at all... it may be a replacement body with original base.
Thanks Ron,
Jack