Well I picked up my Model 13 tonight.Its in a little better condition than the 12.Doesnt have an adjustable trigger,but has the PH7 sight.The slide on this rear sight releases with a small lever,and it has the tube front sight with insert.The barrel is still 29" but much lighter than the 12.There is a sling stud located on the barrel and 2 on the forestock.Also a small threaded brass disk,perhaps a mount for an insert case.I think this gun will be much easier to hold offhand.I'll find out on Sunday.I hope to start a collection of these wonderful old .22s They are very well made and the first one I bought shot very well.