Hello Everyone,

I'm searching for information on some M1903 stock markings that have generally been attributed to US Navy issue. Specifically, the markings I am curious about are stamped block letters over numbers such as "AA 30" or "B 16" on the right side of the buttstock. My understanding is these are likely rack numbers of some kind, but where did this consensus among collectors come from that has linked them to the US Navy? Does anyone have documentation or photos that this was only a practice among Navy armorers? Another question I have along these lines is what about US Marines serving aboard Navy ships on sea duty? Do you think these Marines would have rifles marked differently than their Navy counterparts? Any thoughts?
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