How many firearms in total were owned by civilian population between 1836 and 1912 in USA (cumulatively, not simultaneously)?
The timeframe is what I would consider "Old West" timeframe, but starting with Colt's introduction of his firearm.
If there's no good statistics for total ownership, I am OK with an approximation by adding up all recorded sales to civilians + all recorded sales of military firearms (esp. after Civil War) to other parties.
Ideally, I would like a breakout between handguns and long guns, but that's not required.