This is an inside magazine tube for the Marlin model 99M1 & 75 rifles. It replaces Marlin part number 507122. It is 10 1/2" from the tip of the knurling to the end of the tube and 11 13/16" overall. It fits serial numbers that begin with 25 and up (or if your rifle has NO serial number). We had these made with a metal follower instead of plastic. It is a reproduction made exactly like the original.
IF YOUR OUTSIDE MAGAZINE TUBE MEASURES 9 15/16" AND THE "J" LOCKING NOTCH IS 1/4" (0.250") DEEP: THIS IS THE CORRECT TUBE
If your rifle calls for the later model and you have a serial number that starts below "25" for the first two digits, you need part number 507422 that can be found here:
