Good question- with no clear answer. First, Fanny Kaplan did not kill Lenin. He lived several years after the event in 1918. Secondly, it is now questioned whether she actually shot him- or if this was a staged event for political purposes. The firearm is question is referred to as a "Browning revolver". However, Browning did not make revolvers- they made automatic pistols. A likely candidate is a Browning 1900 or a Browning 1910 pistol. However, I have no definitive answer for the make, model or caliber of the gun supposedly used. Sorry.
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