Privacy guaranteed - Your email is not shared with anyone.

Welcome to Glock Forum at

Why should YOU join our forums?

  • Reason #1
  • Reason #2
  • Reason #3

Site Description

Can't disassemble my 870!

Discussion in 'Tactical Shotguns' started by Summit, Mar 29, 2010.

  1. Summit


    Jan 16, 2010
    So i haven't been able to shoot my new 870 hd, because i can't figure out how to take it apart and clean it. Its the 870 with the 18 inch barrel and +2 extension. I think im missing something in my manual, because the manual is for the normal ones and says nothing about the HD model. The magazine cap won't screw off...its impossible. Any tips on what do would be greatly appreciate...ive searched the net and can't find a thing.
  2. Meat-Hook


    Mar 13, 2002
    start by unscrewing the barrel clamp.

    Once the barrel clamp has been unscrewed/removed then the +2 extension should unscrew right off. Watch to make sure the spring doesnt come flying off. The barrel should come off as well as the bolt assembly.

    im sure others will chime in with additional advice.


    Follow this video. Everything is the same except for the barrel clamp and the mag extension.

    Like Meat-Hook said, be careful when unscrewing the mag extension, because the spring in there is under tension and likes to fly out if you aren't.
    Last edited: Mar 29, 2010
  4. NWHathway


    Apr 1, 2009
    It's just tight. Get a rubber strap wrench and use that, or try hitting the but on the ground hard is supposed to lossen it up. I had the same problem with mine when I first got it.
  5. Glockman454


    Nov 21, 2004
    hit the butt of the gun on the ground? I don't see the benefit of doing that...

    That sounds like a hillbilly-how-to for sure. May I ask where you heard that from?
  6. Summit


    Jan 16, 2010
    pretty lame i have to buy a wrench just to take it off...i don't have a big enough one and me and a few buddies took turns trying to turn the thing...
  7. cj5mrt


    Dec 26, 2005
    Central FL
    Make sure your gun is empty. Put the butt on the floor, push down on the muzzle and try unscrewing the ext. Worked on a friend's gun that was real tight.

  8. Glockdude1

    Glockdude1 Federal Member CLM

    May 24, 2000
    Why do you need to remove the ext?
  9. You have to to get the barrel off.
  10. DrMaxit

    DrMaxit Dirtbag Airman

    Sep 15, 2005
    Oahu HI
    Banging the butt on the ground does work, it loosens up the tension a little (same with automotive work) and also pushes the barrel back. After you do that push on the muzzle and/or hit the end of the muzzle and the mag cap with a rubber mallet, you wont hurt anything. It will come off. I don't suggest using a wrench as it will mar the finish, a strap wrench may work if you can get it on there tight enough. You're not going to hurt the weapon.
  11. aippi


    Jun 12, 2009
    I simply wrap a strip of nylon webing around the mag tube coupling and use channel locks to break it lose then screw it off with my hands. You only have to break it lose with the wrench and it comes off easily with your hand. I buy hundreds of new 870 HD's a year and have to strip them all down to build my tactical shotguns and this procedure works on every one of them and does not mar the finish on the mag tube coupling. It is no different then using the wrench that Brownells sells.
  12. Meat-Hook


    Mar 13, 2002
    "The magazine cap wont screw off"

    on the 2+ extension there is no "cap". It looks like one,..but its not.

    Its actually part of the +2 extension tube. Its all one piece.

    You can wrench on it all day until you break it. What you have to do first is remove the barrel band---barrel clamp that connects the barrel and the +2
    extension tube together. It is the barrel band/clamp that keeps the TENSION on the +2 tube,.......since there is no real "cap".
    Last edited: Apr 1, 2010
  13. aippi


    Jun 12, 2009
    I am not picking on anyone here but the the info about the Remington LE extension being one piece is incorrect. It is not one piece, it is a mag tube coupling and a tube. The rule is they come off together and install apart. when you install it you install the mag tube coupling first. This allows it to use all the availibe threads and also holds the barrel on while you install the rest of the extension. You then install the follower and spring. work the spring down and then install the tube but not all the way down as you want to get it a few turns from complete then bump the mag tube coupling with the heel of you hand to ensure the spring is not binding in the threads. Then screw the tube the rest of the way. Install the bracket and you are done.
  14. AKJD


    Dec 3, 2004
    Fairbanks Alaska
    As simple as it may appear on the surface, there is actually a correct way to install the magazine extension on your Model 870 or 11-87. By following this installation procedure every time you assemble the weapon, you will prevent feeding problems that can arise from improper assembly. These problems result from screwing the magazine extension into the magazine extension coupling and then tightening the assembly onto the barrel. This process forces the ends of the magazine tube and extension tube together and will cause one or both edges to roll in towards the interior of the tube. Once this rolled edge has been created, it will cause the magazine follower to stick inside the extension tube when you fully load the magazine. With the follower stuck, you will have no compression on the shells and, therefore, no feeding.

    So, the correct installation procedure is as follows:
    Assemble weapon as normal until it is time to install the barrel.
    Seat your barrel (and fore-end on 11-87).
    Tighten the magazine extension coupling onto the magazine tube to secure the barrel to the receiver.
    Insert the magazine spring.
    Slip the extension tube over the magazine spring, compressing it and screw the extension tube into the coupling until it is “finger tight.”
    Install the magazine extension bracket and magazine extension bracket screw.
    Function test with dummy shells.
    This installation procedure will allow the magazine extension tube and the magazine tube to make light contact and provide a nice, smooth edge over which the magazine follower can pass.