A model 10! You like complicated mechanic Lance! I search and found no butt stock or duplicate one who look like your pre 1920 model 10 but I found a manual from the US war department about all types shotguns (Model 10 Page 111) it's free to take a look at! Wish you good luck 
http://usacac.army.mil/cac2/cgsc/car...9_285_1942.pdf
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Gilles.
1988 2072 401 54" hyd angled blade
1988 1872 364 snowblower/C50 deck
1976 1650/QA42A blower/44A deck/standby
1976 1450TS/Sleeve hitch/44A deck/in storage
1963 100 (red)/in storage
2010 Kubota 2380-2/42" infinity deck (engine swap)
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