I will have to go in and have someone measure the chamber length to be certain. I am pretty sure they are 2 1/2",and are not 2 3/4". However just to be sure they are not 2 inch I will have it measured. It is a very sound gun. It locks up like new and the barrels are in perfect condition with no pitting or dull spots. They are shiney and ring like bells. I just finished pinning the gunstock today. I am going to send it in after I get it fit exactly to my demensions and have a new one cut out on a pattern machine.