greetings
you have purchased a Wanzl .54 cal breechloader converted in 1867 from Lorenz rifled musket.calibre is 14*33mm Wanzl rimfire.i have one as well in excellent condition,shoots well with custom made cases and projectiles casted for burnside carbine which is also .54.about 70000 rifles were converted to Wanzl .54 rimfire in 1867-68.it is quite a rare and well designed arm,well done.