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I can find a schematic of the Stevens 77 but if it is a pump shotgun with a none take down barrel ( permanent) You probably take off the stock remove the trigger assembly and everything comes out the back. If the barrel is not easily removed this is just about the only way the bolt can come out.Goto this site http://stevespages.com/page7a.htm and find a SAVAGE or STEVENS that looks close to what yours looks like. SAVAGE/STEVENS made many guns and seemed to change the model numbers every year. They are all very similar.