I just recieved this gun and would like to find out what i can about it. What do yall think I have here? 42" aprox 36 cal. Half stock walnut. 2 piece iron buttplate, 3 pices iron trigger guard, single phase set triggers, poured nose cap and brass entry thimble, brass toe plate. Barrel has slight swamp and is bigger at muzzle than breech. ivory or bone insert for front sight. mssing side plate { where have i seen a side plate shaped like this before? looks so familier} The nipple bolster is dovetailed into the side of the barrel and soldered