Marlin Model 60 99C & 990 (Post 1975) Inside Magazine Tube P/N 507522

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This is an inside magazine tube for the Marlin model 60, 99C, & 990 rifles.  It replaces Marlin part number 507522.  It is 20 7/8" from the tip of the knurling to the end of the tube and 22 1/8" overall.  It fits serial numbers that begin with 11 and go through 25  (outside tube "J" notch length must be 11/32").  We had these made with a metal follower instead of plastic.


If your serial number starts with 26+ or there is NO serial number, you need part number 607222 found here.

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  • 5
    Marlin inner mag tube and spring

    Posted by James B Harrison on Feb 24th 2023

    Loved it it fit better then the factory ones I've seen before. Good quality. Will definitely come to you guys for any future needs. Thanks

  • 5

    Posted by Jason on Apr 5th 2021

    My gun would not feed any of 5 brands/types of ammo with the original mag. The mag from my other mod 60 would feed two brands in this rifle. The new tube fed all 5 flawlessly. The tube was crushed by the post office, so I was worried, but the mag was so well protected, it was perfect. Thank you!

  • 5
    Magazine tube

    Posted by Rex on Jul 16th 2020

    Awesome job. Service was great shipping was fast and i got the right part the first time. The part fit perfectly. i Will definitely be using you in the future. Thanks