i think that there were two types of nm m14 stocks that the govt had in inventory, but not at the same time. i have one of the birch routed stocks that is in the std profile, with all the metal attached. i also have one of the heavy walnut stocks, routed out for a rear lug, that came in a us govt plastic wrap w/inventory # on the bag. those big stocks came in walnut or birch. i sold the birch one, but kept the walnut one (why i don't know). i think that the amu used the big honking stock for long range guns that produced a lot of recoil when loaded to 1000 yrds.