This Marlin manufactured late variation inner magazine tube assembly is for the model 99 M1 semi-auto rimfire rifle manufactured after June of 1975 and is in very good condition with light wear and a tarnish to the brass. (file photos)

Note: Please check the serial number listing at the top of the page to determine the year of manufacture of your 99M1 rifle. If your rifle was manufactured specifically in 1975, it would have the first two digits with a "25", thus we have found the 99M1 maunfactured in 1975 and using this late variation magazine tube assembly with serial numbers as low as 25398485.