Post WWI M1917 stocks are manufactured with extra material. They were designed to be hand fitted to the barreled action by an armorer. Obviously this one wasn't. There are some pressure points for the barrel that need to be correct when setting up a M1917 or a P14 for correct accuracy. When that was achieved the excess material was supposed to be trimmed off.

The Britishicon also manufactured some M1917 looking stocks for their P14 rifles in 1938 & 1939 when they were doing their "Weedon" referbs. Chances of this being one of those are very slim however.

There is also the possibility that it is a commercial reproduction that the rifle was just dropped into to make it work for parades and funerals. - Bill