Well I purchased this gun and shot it yesterday. Chambers measure 2 7/8". I have attached a few more pictures, clearly the gun had little use. Weighs 10 lbs 7 oz. bores are very nice. I did notice the it is engaged on one lock and on the barrel SHUL PARUSSIA not PRUSSIA. Also on the bottom of the barrels the marked initials WS or SW. Depending on which way you look a it. I have signed up for the German gun forum. Hope fully I will get confirmation soon and can post pictures there. Thanks to all that have shared information so far.