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Thread: Stevens 520 Disassembly (also woks for sears model 30 and western field model 30)



  1. #1
    Gun Wizard
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    Stevens 520 Disassembly (also works for sears model 30 and western field model 30)

    After doing much searching on the web, and not finding any detailed instructions on the matter; I decided to write this little piece on how to disassemble one of these shotguns. Since I needed to strip one down, to give it a very good cleaning to remove a heavy accumulation of shooting residue developed over it's 80 something year lifespan, I decided to take a few pictures along the way. So here goes:
    First, make sure gun is unloaded, then move slide back with safety in the on position.Then grasp the ridges at the front of the magazine tube and turn the tube clockwise (as you would be looking down the barrel).

    Turn the tube until the 'keystone' of the magazine tube support withdraws itself fully from its notch in the receiver, and until it stops.
    At that point, push the barrel assembly gently downwards and the bottom of the receiver behind the ribbed barrel block gently upwards at the same time. The barrel assembly will slide down out of the receiver a short distance until it is stopped by contacting the action bar, inside the receiver. Then slide the forearm all the way forward, maintaining a grasp on the barrel assembly and receiver assembly as they should easily separate at this time.

    Push the barrel assembly down the rest of the way out of the receiver.

    This completes the 'takedown' of the gun into its two major components.

    To dis assemble the receiver, start by removing the stock. This can be done by removing the screw, and gently pull apart.


    Next, remove the trigger group. This can be done by removing pin from forward end, and the screw from the rear end. Then slide trigger group down out of receiver. I did this with ejection port facing down to keep slide lock mechanism intact during removal.



    Next remove shell lifter. This can be done by removing the screw on right hand side of receiver. Before removing, look to make sure how everything is positioned for reassembly purposes.then slide down and out of receiver.

    Next, remove bolt and bolt carrier. This is done by removing bolt stop screw (forward left side of receiver), then sliding parts forward out of receiver.


    Man, what a hunk of steel!


    Re-assemble by reversing order.
    Last edited by stevens520; 01-13-2012 at 12:17 AM. Reason: add pics
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  2. #2
    Tenderfoot
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    the very first step of turning the tube is concerning me. do I have to unscrew the front mounting piece? Any more in depth info on this would be appreciated. I just bought this gun and I don't know if it has ever been apart. so without knowing the correct procedure I don't want to torque on something in the wrong way. Thanks
    Last edited by stevesm; 01-12-2012 at 06:38 PM. Reason: additional info

  3. #3
    Gun Wizard
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    Nope, you don't have to remove any screws to take the gun down; just rack the slide back and turn the mag tube. The one I have didn't look like it had ever been broken down before, but it did come apart easily. Just don't overdo turning the tube, just do it far enough to get the little "keystone" out of the notch on the receiver (I did it once and had the part get stuck on the tube, and had a heck of a time trying to get it freed up again.), and you may have to push in on the mag follower so that it can clear the receiver when sliding the forend out of the receiver. I found it a little daunting a first too, but it really isn't that bad. And Welcome to Marlin Owners!!!!
    Last edited by stevens520; 01-12-2012 at 09:53 PM. Reason: addition
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  4. #4
    Tenderfoot
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    Thanks, I'll look at it again.

  5. #5
    Gun Wizard
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    No problem, let me know how it works out for you. And the folks around here tend to like gun porn hint hint.
    The world is much better with a pair of calipers.
    Team 30-30 member #258

  6. #6
    Tenderfoot
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    Thanks again. I just finshed breaking it down. Cleaned it and put it back together. Your tutorial was great for help in reassembly.Technically mine is a western field 30.But, same. The first pic shows the gun the second shows the "keystone" Again, your post was a great help.

    002.jpg003.jpg
    Last edited by stevesm; 01-13-2012 at 06:18 PM. Reason: pics

  7. #7
    Gun Wizard
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    Glad to help. The one I tore down was my wife's gun, and is actually a Sears Ranger 20 GA.
    The world is much better with a pair of calipers.
    Team 30-30 member #258

  8. #8
    Tenderfoot
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    any Idea on where to find the year of manufacture ?

  9. #9
    Gun Wizard
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    From what I have gathered, Stevens did not keep any records, but the 520's were discontinued around 1930, and was replaced with the 620. The flat top versions (also known as 520A and have heard them referred to as a 520-30) were produced later, with the humpback versions being of earlier manufacture.Haven't been able to pin down a date when the change took place though. They started assembling the 520's again for the war effort during WW2. I did get to fondle a nice older hump back in 16 GA the other day at my LGS, but my excitement wore off when I saw the price....499.00.
    Last edited by stevens520; 01-14-2012 at 06:49 AM.
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  10. #10
    Tenderfoot
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    Yeah, those kind of prices would turn me off too. Well thanks for all the good info,You have helped a lot.


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