Best Remington 870 Parts & Accessories for 2026 (Tactical & Home Defense)

The best Remington 870 upgrade is a magazine extension, and the part that makes it fit is a tool nobody mentions. The 870 is the most modified shotgun in America and the most confusing to buy parts for, because the gun in your safe is probably an Express, a model RemArms no longer makes, while the current catalog is all Fieldmaster. Here are the eight upgrades worth making, what each one actually fits, and the factory dimple that stops half of them.

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Table of Contents

Remington 870 Upgrades at a Glance

Upgrade	What it is	Fitment
Magazine Extension Tube	Magazine tube	12 ga; the tube dimple must go first
XS Magazine Tube Detent Swage	Fitting tool	Remington 12 gauge tubes
Magpul SGA Stock	Stock	870 only; the Mossberg SGA is a different part
Magpul MOE M-LOK Forend	Forend	870 only, and 12 ga
Ghost Ring Sight Set	Sights	Varies: some clamp, some replace the rib
Streamlight TL-Racker Forend Light	Light	870 version; the Mossberg one will not fit
Mesa Tactical SureShell Side Saddle	Shell carrier	12 ga, and handedness matters
Picatinny Receiver Rail	Optic mount	Uses the receiver holes already in your gun

Which 870 Do You Actually Own?

This matters more than it used to. RemArms' current Model 870 lineup is Fieldmaster, Wingmaster, SPS, Synthetic Tactical and Home Defense, and the word Express does not appear on it at all. Yet the Express is what most 870s in circulation are, and what most parts listings still say.

• 870 Express: the volume model for three decades, with a matte bead-blasted finish instead of the Wingmaster's polish. Discontinued at the maker, everywhere in the used market, and the gun most of this page is aimed at.
• 870 Fieldmaster: the current replacement. RemArms describes it as offering the dependability of the Wingmaster “at a much more affordable price”, which is exactly what the Express was for.
• 870 Wingmaster: the polished blued sporting gun, still in the lineup.
• 870 Police / SPS: heavier-duty variants, and the Police guns use different internals from an Express in places that matter to a gunsmith and to nobody else.
• 870 Tactical / Home Defense: short-barreled factory builds that already have some of what is on this page fitted.

For accessories the good news is that the receiver, magazine tube and barrel interface barely changed across all of them, so a stock, forend, side saddle or rail listed for an Express will fit a Fieldmaster. What does NOT cross is gauge: a 12 gauge part will not fit a 20 gauge 870, and that is the single commonest ordering error on this gun.

1. Magazine Extension Tube: Best Capacity Upgrade

The single most useful thing you can do to a defensive 870 is give it more than four rounds. An extension tube replaces the factory magazine cap and runs the tube out toward the muzzle, taking a 4+1 gun to 6+1 or 7+1 depending on length and shell.

Read the next entry before you order one, because on most 870s the tube has a factory dimple in it that physically stops an extension seating, and how you deal with that decides whether the job takes ten minutes or ruins a magazine tube.

Best for: A home-defense 870 that currently holds four.

2. XS Magazine Tube Detent Swage: The Tool That Makes It Fit

This is the part almost every 870 upgrade guide leaves out. Most Remington magazine tubes carry a pressed-in dimple, a detent that stops the factory magazine spring and follower escaping. An extension tube will not pass it, and the internet's answer is a drill bit or a Dremel.

The swage is the tool made for the job: it presses the dimple back out from inside rather than cutting metal away, so the tube stays round and stays strong. That a dedicated tool exists, and is stocked by three of the retailers we track, tells you how common the problem is.

Best for: Anyone fitting an extension without butchering the tube.

3. Magpul SGA Stock: Best Stock

The factory 870 stock is a compromise sized for an average adult in a shirt, and it fits almost nobody in a jacket or behind body armor. The Magpul SGA is adjustable for length of pull through spacers, takes cheek risers if you have mounted an optic, and gives you real sling attachment points.

Check what you are ordering. Magpul builds the SGA for the 870 and separately for the Mossberg 500 and 590, and our retailer rows return both under a plain search for the stock. They are not interchangeable.

Best for: Anyone the factory stock does not fit, which is most people.

4. Magpul MOE M-LOK Forend: Best Forend

The factory 870 forend is a grooved tube that does one job. The Magpul MOE version adds M-LOK slots along its length, which is how you mount a light without a clamp hanging off the magazine tube, and gives you a grip surface that works with wet hands.

It is a twenty-dollar part that changes how the gun handles, and it is the natural companion to either a light or a proper sling. If you want the light integrated instead, look at the TL-Racker further down, which replaces the forend entirely.

Best for: Getting a light or a hand where you want it.

5. Ghost Ring Sight Set: Best Sights

A bead is the right sight for a moving target in daylight and the wrong one for anything else. If your 870 shoots slugs or has a defensive job, a ghost ring aperture is dramatically faster and more precise than a bead, and it works far better in bad light.

This is the pick where fitment varies most. Some sets clamp to the barrel or the receiver and go on in minutes; others expect a vent rib removed or a rail fitted. Read what a set actually needs against the 870 you own before you order.

Best for: A defensive 870 that has to be aimed, not pointed.

6. Streamlight TL-Racker Forend Light: Best Weapon Light

A shotgun used for home defense needs a light, and the usual answer is a clamp on the magazine tube that snags and shifts. The TL-Racker replaces the forend itself with a thousand-lumen light built into it, activated by the hand that is already there.

The critical thing when ordering is the model. Streamlight builds the TL-Racker separately for the 870 and for the Mossberg 500 and 590, and a plain search for the light returns both, which is why the card here excludes the Mossberg versions.

Best for: A house gun. You cannot shoot what you cannot identify.

7. Mesa Tactical SureShell Side Saddle: Best Shell Carrier

Spare shells are only useful if they are attached to the shotgun. The Mesa Tactical SureShell is a machined aluminum carrier that mounts to the receiver and holds six rounds where your support hand can reach them, which is a genuine upgrade over a nylon sleeve that stretches.

It mounts using the receiver holes and the trigger pin, so it needs no drilling on most guns. Order for the correct side: a left-side carrier on a right-handed shooter is the normal choice, and our rows carry both.

Best for: Keeping six more shells on the gun rather than in a drawer.

8. Picatinny Receiver Rail: Best Optic Mount

A red dot suits a shotgun better than most people expect, because a shotgun is aimed at close range under stress and a dot removes the alignment problem entirely. The receiver rail is how you fit one: 870 receivers are drilled and tapped from the factory, so the rail uses holes that are already there.

Buy a rail that is machined rather than cast, and use thread locker. A shotgun recoils harder than anything else this part will meet, and a rail that shifts a fraction takes your zero with it.

Best for: Putting a red dot on a shotgun without drilling anything.

How to Prioritize Your 870 Build

The 870 rewards a small amount of money spent in the right order. This is that order.

• First, capacity. A four-shot home-defense gun is the thing worth fixing. Extension tube, and the swage to make it fit.
• Second, a light. Identifying a target is not optional and a shotgun is a poor flashlight.
• Third, the stock. A gun that fits you is a gun you shoot well. This is where the Magpul SGA earns its price.
• Fourth, sights. Only if the gun shoots slugs or has a defensive role. For birds the bead is correct.
• Last, shells on the gun and an optic. Both are genuinely useful and neither matters as much as the four above.

Mistakes to Avoid Buying 870 Parts

• Ordering a 20 gauge gun a 12 gauge part. Nothing crosses. Check the barrel marking before anything else.
• Buying an extension without a plan for the dimple. It will not seat. Swage it out properly rather than reaching for a drill.
• Taking a Mossberg part because the name matched. Magpul and Streamlight both build 870 and Mossberg versions of the same product, and a plain search returns both.
• Assuming Express parts are a separate category. For everything on this page they are not: Express, Fieldmaster and Wingmaster share the interfaces that matter.
• A cast rail on a shotgun. Recoil is brutal here. Machined, and thread locker.
• Ignoring handedness on a side saddle. It is the one part where left and right are genuinely different products.

Bottom Line

Work out which 870 you have, then check the gauge on the barrel, because those two facts decide everything else. For a defensive gun, buy the extension tube and the swage together, because one without the other is a part you cannot fit. Add the TL-Racker if the gun lives by a bed, and the Magpul SGA if the factory stock does not fit you, which it probably does not. Everything else on this page is a genuine improvement and none of it matters as much as those three.

Last updated September 10th 2026