first Saftey,,don't shoot an unfamiliar weapon,,second,,lets get a look at the weapon,,post some multiple pics of the sl80-121 so we can better examine what your saying ,,third,,you will need a manual,,start a web search,,,fourth,,keep up,,when I reply you reply,,,,I say this because of you're lack of expierence on Benelli shotguns,,,,and the uniqueness of the pre 1986 Benelli shotguns,,,you and I can both learn from this but you got to stay in touch this time,,don't go running off for a year,,the 121 m1 is a great shotgun,,lets have fun and share the wealth,,