That's the lever that you use to unscrew the magazine tube for the take-down.
Printable View
https://i.imgur.com/qhQrkxZ.jpg
Rossie Model R92 in .45 Colt with my Ruger Bisley Vaquero in the same chambering.
https://i.imgur.com/3Upmykp.jpg
My .357 Magnums, Marlin Model 1894CSS (JM stamped) and Winchester Model 94AE "Trapper" along with my Ruger Model KGP-141 and S&W Model 586.
https://uploads.tapatalk-cdn.com/202...4db1c8eb0.jpeg
Shiloh Sharps Model of 1874 in .45-2.10”. “Montana Roughrider”
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https://uploads.tapatalk-cdn.com/202...56a0e0cb2.jpeg
Ruger No.1 in .375 H&H Magnum. My favorite rifle to shoot honesty. Love it. Great gun. Planning a hunt with it now in South Carolina.
https://uploads.tapatalk-cdn.com/202...fdddf8e3c.jpeg
https://uploads.tapatalk-cdn.com/202...3de11eb2f.jpeg
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https://uploads.tapatalk-cdn.com/202...0fe3c23e46.jpg
‘99 Marlin 1895G wearing Winged Skinners.
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https://uploads.tapatalk-cdn.com/202...bfd161a61.jpeg
‘01 Marlin 1895CB in .45-70
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Thank you