Don it is very common to find a P14 in a Model 1917 stock. My own Remington P14 came in a beautiful Eddystone Model 1917 stock. I replaced that with a Remington P14 stock and transferred my sporter 1917 into the Eddystone. There was a Britishmanufacturer whose name escapes me that made M1917 style stocks for P14's during the Weedon refurbs. There were also many 1917 stocks that were shipped to Britain during the first war for use as spares.
Will it be accepted at Camp Perry? Sorry but that is a question I can't truthfully answer as I have no experience in dealing with them. In my limited match experience, the rules seem to be set by the judges on the morning of the match. I'm sure Perry is somewhat different however than the local matches I've been in. I would contact someone there for proper info. - Bill