I picked up a gun collection some years back and just got around to researching some of the older guns. One has me stumped. Its a U.S. M1917 Enfield production date of April 1918 - based on the serial# range, 50300. It has a Lyman rear sight and all the usual markings line up on the barrel and receiver. The stock is what I can't identify. Its smooth with a forearm cap (like a Rem 700 BDL) and no upper wood cover (upper barrel is exposed). Is this someones idea of an "enhancement" or an official version of this riffle?