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Remington 870 Disassembly and Reassembly

07 December 20113 comments Advice, Best, Upgrades

UPDATE: Remington 870 Disassembly and Reassembly

I plan to record a video showing Remington 870 Disassembly and Reassembly but now I want to share instruction with photos on how to disassemble and reassemble Remington 870 shotgun.

Never forget about the safety rules when disassembling shotgun. There are known cases when carelessness during disassemble of a gun was cause of a dangerous accidents.

WARNING! Check the ejection port, chamber and magazine tube to make sure that there are no shells in the shotgun.

Remington 870 Disassembly

1. Engage the safety.

2. Push the action bar lock upward and pull the forend back to open the action.
Slide the forend back approximately halfway.

3. Unscrew and remove the magazine cap (magazine extension).
If you have a magazine cap, spring is held in place by a magazine spring retainer, if you have a magazine extension, spring is held by extension itself and will fly away when extension is removed, be careful to hold the magazine extension firmly and decompress magazine spring slowly.
Attention! Magazine spring is under pressure, wear eye protection.

4. Take out the magazine spring and follower.

5. Pull the barrel from the receiver.

6. Compress and hold the left shell latch.

7. Slide the forend forward and off the magazine tube. Hold the bolt and the bolt carrier because they will fall off from the action bars.

8. Take out the bolt and bolt carrier from the rear of the action bars.

9. This step is for the Remington 870 which doesn’t have magazine extension and spring is kept in place by the magazine spring retainer.
Attention! Magazine spring is under pressure, wear eye protection.
Insert a flat head screwdriver into the slot in the magazine spring retainer. Push the magazine spring retainer into the magazine tube and rotate it. This will allow you to take it out.

10. Push out and remove two pins from the receiver.

11. Take out the trigger group. If you have pistol grip stock you may experience a problem removing the trigger group from the receiver. There is no need to remove the stock, there is a simple solution, just push the carrier forward to the magazine tube and then pull out the trigger group.

Remington 870 Reassembly

Reassembly is simple, just reverse the process.
1. Insert trigger group assembly into receiver.
2. Align trigger group with the holes in receiver, insert pins and push them in.
3. Put the bolt assembly in; set it on top of the notches on the action bar assembly.
4. Slide the action bar assembly onto the magazine tube. Line it up with receiver.
5. Push the left cartridge stop and slide action bar assembly into the receiver.
6. Push the action bar lock upward and pull the forend back to open the action.
7. Slide the forend forward approximately halfway.
8. Put the barrel on.
9. Put the follower and spring into magazine tube.
10. This step is for the Remington 870 which doesn’t have magazine extension and spring is kept in place by the magazine spring retainer.
Install a magazine spring retainer. Insert a flat head screwdriver into the slot in the magazine spring retainer. Push the magazine spring retainer into the magazine tube and rotate it.

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Comments

  1. Mark April 28, 2012

    Vitaly, If you do make a video, you might go over the “other style” of mag spring retainer, the one you have to pry out and push back in. I’d hate to see someone with no knowledge stick a screwdriver in one of those and turn it expecting it to do something. (Your book too) Also there are different slides (what you are calling “bolt carrier”) for the 870. One is shown as depicted above and the other has another notch toward the rear on the left side that seats over a corresponding cog on the left action bar. If someone took apart one of each (as I did) when they put them back together, the old slide (without the notch) will only fit on the action bar without the cog. The new slide (with the notch) will fit on either. I couldn’t find any further information regarding when or why, and also what the cutout on top of some not all of the slides is/was for. The only thing that comes to mind is for a bolt handle to go into, as in an 1100. That’s todays news! Mark

    • Vitaly Pedchenko May 10, 2012

      Mark, thanks for the idea. I will make a video soon, but not sure if I can get the other spring retainer.

      • Lee Lewis November 17, 2013

        I presume the older models have the type of spring retainer the other gentleman is referring to in his post. Mine is 1989 or 1990 vintage and it has the friction fitted versus the slotted type. The spring is compresses enough to surprise and cause of few blue words to come out if not careful when removed said device…there is still a cloud hanging over Bath County, Virginia, since the spring of 1991. I would be more than glad to send a simple picture of necessary

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