[2019] Buyer’s Guide: The Best Magazine Extensions for Remington 870

The Remington 870 is a great weapon for home defense, tactical use, and hunting. But its limited ammo capacity can be an annoyance for owners looking for more than the standard 5 shots. Luckily, the barrel of the Remington 870 attaches around the magazine tube, allowing for the possibility of extending the tube further to fit more shells.

An easy fix is to use one of the magazine extensions available to extend the capacity of the gun. Depending on your Remington 870 model, installing the magazine extension may require some effort. To assist with this, we’ll help you select the right parts and guide you through the installation process, which can get a bit tricky.

Remington 870 Magazine Extension Comparison Chart


Our Rating


Scattergun Technology - Remington 870/1100/11-87 

Choate - Remington 870/1100/11-87 MATTE 

Choate - Remington 870 

Tacstar Remington 870/1100/11-87 

What Is a Shotgun Magazine Extension?

Unlike rifles and handguns, most shotguns don’t have magazines that you can attach to them for loading shells into the chamber. They usually require the user to load the shells into the chamber by hand instead.

However, some shotguns can have magazine extensions, which act like magazines, since they can hold shells in addition to the standard capacity. These extensions are shaped like hollow tubes that replace the regular magazine cap of the shotgun. The extension comes with a kit that adds functionality and allows for the tube to be clamped to the barrel of the gun for a secure grip and great look.

How to Pick a Great Magazine Extension

When selecting the magazine extension for your shotgun, keep in mind the material, durability, design, capacity, and fit of the item onto your shotgun.

The material of the extension will determine the weight and durability of the part. The magazine extension is usually steel or aluminum, but can be plastic as well. You should go for one of the two metal options, as the plastic extensions are not robust enough for heavy use.

The fit of the extension onto your gun also matters. You don’t want to end up with an extension that is too tight to be screwed in all the way, nor one that sticks out awkwardly from under your barrel.

Most magazines for the Remington 870 fall into either of these two categories, single-piece and two-piece. Extensions made from a single solid piece of metal, such as the Tacstar are preferable to stamped pieces, due to the way they fit perfectly to your gun.

Single-piece extensions are easy to install and remove, and don’t need any additional tools. On the other hand, there is a tradeoff for these single piece extensions as the shell rim and magazine follower inside the tube can get stuck at the point where the extension screws into the magazine. The best way to prevent this is to test the extension with any accessories you plan to use to ensure it works correctly, with no jams.

Two-piece extensions are usually more versatile, and repairing damaged extensions is easier as individual parts can be replaced, instead of replacing the whole extension. They can also be more reliable, if well-designed.  

Quick Take - The Best Remington 870 Magazine Extensions

Reviews of the Best Magazine Extension for Remington 870

Now that we’ve highlighted some of the main considerations that go into choosing a great magazine extension for your Remington 870, let’s take a look at some of the top models that made our list!

  1. Scattergun Technology - Remington 870/1100/11-87 Extended Magazine Tube

Made from machined steel, this magazine extension increases the capacity of a Remington 870, 1100 or 11-87 shotgun by either 1 or 2 shots, depending on the model selected. The threaded collar screws onto the end of the magazine tube and includes a magazine spring and unbreakable nylon follower.

It comes with either a stationary loop or a quick-detach swivel stud to accept slings of different types.


  • Looks good
  • Easy to install
  • Tough and durable
  • Works with many guns


  • Heavy duty

Bottom Line

Buying this extension is a no-brainer if you want a product that will last and is going to fit your shotgun perfectly.

2. Choate - Remington 870/1100/11-87 Matte Shotgun Magazine Extension

This easy to attach magazine extension is made from steel and comes complete with a matte finish. It includes an extended spring, follower and swivel clamp, which secures the extension to the barrel.

The threaded tube replaces the shotgun magazine cap screw to allow for extra slugs while a sling swivel clamp is available separately. Models come in 2, 3, 4, and 5-round extension options.


  • Looks good
  • Easy to install
  • Tough
  • Good fit and finish


  • Supplied spring is long

Bottom Line

While some users report having to trim the spring down to size, this extension is a solid purchase and will more than get the job done. One of the greatest benefits reported by recent buyers is its ease of use when the time comes for installation.  

3. Choate - Remington 870 Shotgun Magazine Extension

This easy to attach magazine extension is made from steel with a matte finish. It includes an extended spring, follower and swivel clamp, which secures the extension to the barrel.

With this, the threaded tube replaces the shotgun magazine cap screw to extended the maximum load of the gun. Additionally, a sling swivel clamp is available separately. Models come in 3, 4, 7, and 10-round extension options.


  • Fairly easy and quick to install
  • The finish will match the matte finish of a shotgun
  • Solid and robust extension tube
  • Spring and follower are much better than the factory ones


  • Doesn’t come with instructions

Bottom Line

You can buy this extension with confidence, knowing that it will not only look good, but perform admirably no matter what capacity you select.

4. Tacstar - Remington 870/1100/11-87 Shotgun Magazine Extension

This extension tube comes in a blue steel matte finish and attaches directly to the end of the magazine tube, increasing the capacity by as much as five rounds. It comes with an extended magazine spring, and barrel clamps are available separately.


  • Looks good
  • Easy to install
  • Tough
  • Good fit and comes with excellent finish


  • The spring can get pinched at the point where the extension meets the magazine

Bottom Line

This extension is easy to install, but some users may face reliability issues, so test it well with any accessories before buying.

How to Install a Shotgun Magazine Extension

Once you’re selected your magazine extension, its time to install it. Here’s a step-by-step guide for installation:

  1. Remove the barrel nut

  2. Put on the coupler, it doesn’t have to be too tight, just as tight as you can make it with your fingers.

  3. Put the spring in, but be careful at this step. It can get pushed out with force if you aren’t careful.

  4. Take the mag tube extension and screw it in.

  5. Attach the swivel assembly and line it up with the gap.

  6. Insert the screw and tighten it enough to keep it steady.

Some versions come with dremels or dimples that prevent aftermarket modifications such as installing magazine extensions. But there’s a simple workaround for that, which is to simply remove those dimples before doing the steps outlined above. Here’s a step by step guide for removing the dimples:

  1. Remove the spring retainer.

  2. Remove the follower.

  3. Detach the barrel of the shotgun.

  4. Remove the foregrip and the bolt.

  5. Remove the trigger group by pushing out the two pins.

  6. Place a thin flashlight within the tube which holds the shells in order to illuminate dimples.

  7. Next using a carbide burr, drill off the dimples. Be careful at this step, as it requires a steady hand. But stop using the burr when you shorten the dimple.

  8. Next use a grinding stone attachment to grind the dimple even lower.

  9. Finally use a sanding drum to make the tube a smooth as possible.

  10. Replace the trigger group, the foregrip and bolt, reattach the barrel and carry on with the other steps outlined above.


Selecting the right magazine extension for your Remington shotgun boils down to fit, material, and its compatibility with the gun and its accessories. Always test the new extension with the accessories you’ll be using with it to ensure safe operations and no jamming in the future.

When installing the extension on your gun, follow the steps outlined above, but always follow basic safety precautions and take things slow to avoid damaging the extension or the gun. Check out the list of extensions we’ve recommended above for quality parts and a smooth shooting experience with your higher capacity shotgun.

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