Wow! That is indeed a Remington P14 action, with a M1917 barrel attached. The bolt is also from a M1917 based on the flaming bomb insignia on both the bolt handle and barrel. The stock has the semi circular cutout just ahead of the receiver ring which indicates that the rifle was once a P14 converted to "DP" at some point. The stock and rear hand guard originally had matching holes drilled on each side of the stock for easy identification of the hole crossdrilled through the barrel designating it a "DP" unit.
It appears some "enterprising" person made an attempt to revive the rifle to working order by using whatever parts might have been available regardless of whether they were for a P14 or M1917 . I've seen a few of these "DP" P14's refurbished back to working order in the original .303 chambering, but never a cross dressed unit such as this one.
I would either find a M1917 receiver, stock and whichever other parts are needed to make a complete M1917 out of it, or find the parts necessary to return it back to a P14.