The Remington 870 has been America’s pump shotgun for more than sixty years, and nothing on the market is easier to build into exactly what you need. The same gun that fills a duck blind on Saturday becomes a home-defense shotgun on Sunday with a handful of bolt-on parts. Because the 870 platform is so universal, the aftermarket for it is enormous — stocks, forends, magazine extensions, sights, lights, and shell carriers that turn a bare Express or Tactical into a purpose-built fighting or field gun.
Below are the Remington 870 parts and accessories we would add first, focused on a home-defense and tactical build but useful across the line. Everything here fits the 12-gauge 870 (confirm 20-gauge and barrel length where it matters), and each pick is backed by a live price check across the retailers we track.
How we tested: Every pick here was run through our testing methodology. Minimum round counts, accuracy and reliability protocols, the failures that disqualify a gun. If we haven't shot it, we don't recommend it.
Remington 870 Upgrades at a Glance
| Category | Our Pick | Why It Makes the List |
|---|---|---|
| Magazine extension | Nordic / TacStar | More shells on board for defense — the first upgrade |
| Stock | Magpul SGA | Adjustable length of pull, better cheek weld and control |
| Forend | Magpul MOE M-LOK | Positive grip and M-LOK slots for a light |
| Sights | Ghost ring set | Fast, precise aiming over a bare bead |
| Weapon light | Streamlight TL-Racker | Integrated forend light — the cleanest 870 light |
| Shell carrier | Mesa Tactical SureShell | Spare rounds right on the receiver |
| Optic mount | Picatinny receiver rail | Mount a red dot for both-eyes-open speed |
| Sling | Two-point tactical | Retention and hands-free carry |
Best Magazine Extension: Nordic / TacStar
A defensive shotgun lives and dies by how many rounds it holds, and the factory 870’s four-round tube is the first thing to fix. A quality magazine extension from Nordic Components or TacStar adds two to three rounds of 12-gauge capacity and a barrel clamp for rigidity. It is the single most important upgrade on a home-defense 870 — make it first.
Best Stock: Magpul SGA
The factory stock is a one-size-fits-nobody compromise. The Magpul SGA gives you an adjustable length of pull with spacers, a raised comb for a better cheek weld behind a red dot, and multiple sling attachment points — all of which translate to more control and faster follow-up shots. It is the upgrade that most changes how the 870 shoots and mounts.
Best Forend: Magpul MOE M-LOK
Pair the SGA with a Magpul MOE M-LOK forend and you get a positive, aggressive grip surface and M-LOK slots to mount a light exactly where you want it. It is a direct replacement for the factory forend that upgrades both control and capability in one cheap part. The two Magpul pieces together are the classic 870 tactical foundation.
Best Sights: Ghost Ring Set
A bare front bead is fine for birds but slow and imprecise for defensive slugs and buckshot. A ghost ring sight set gives you a fast, repeatable aiming reference that lets you place a slug with real precision out to a shotgun’s practical range. It is a big capability jump for a modest price and one of the smartest 870 upgrades for a fighting gun.
Best Weapon Light: Streamlight TL-Racker
You cannot defend against what you cannot identify, so a light is non-negotiable on a home-defense shotgun. The Streamlight TL-Racker is the cleanest solution: an entire forend with a 1,000-lumen light built in, so there are no separate mounts or pressure switches to fail. It replaces your forend and puts a bright, ambidextrous switch right where your support hand already is.
Best Shell Carrier: Mesa Tactical SureShell
A shotgun holds few rounds, so keeping spares on the gun matters. The Mesa Tactical SureShell side saddle mounts to the receiver and carries four to six extra shells within instant reach for reloads, and many versions double as an optic rail. It is the standard by which shell carriers are judged for durability and retention.
Best Optic Mount: Picatinny Receiver Rail
Want a red dot for both-eyes-open speed on a defensive shotgun? A Picatinny receiver rail bolts to the 870’s drilled-and-tapped receiver and gives you a solid platform for a red dot or low-power optic. It is an inexpensive part that unlocks one of the biggest capability upgrades available to a fighting shotgun.
Best Sling: Two-Point Tactical
A sling is to a long gun what a holster is to a pistol — it is how you retain and carry the gun hands-free. A quality two-point tactical sling lets you sling the 870 across your body, transition to a handgun, or free your hands without setting the gun down. Add the sling mounts your SGA stock already provides and you have a complete fighting setup.
How to Prioritize Your 870 Build
Building a home-defense or tactical 870? Spend money in the order that adds the most capability first:
- A magazine extension and a light first. Capacity and target identification are the two things a defensive shotgun cannot do without.
- Sights. Ghost rings or a red-dot rail make the gun far more precise with slugs.
- A stock and forend for control, fit, and a mounting point for the light.
- A shell carrier and sling to keep spare rounds on the gun and the gun on you.
Want the background on the gun first? Read our Remington 870 Tactical review and the classic Remington 870 vs Mossberg 500 comparison, then see the platform in our best pump-action shotguns, best home-defense shotgun under $500, and best 3-gun shotguns guides.
Frequently Asked Questions
What is the best upgrade for a Remington 870?
For a home-defense 870, a magazine extension and a weapon light come first. The factory tube holds only four rounds, and you cannot defend against a threat you cannot identify, so capacity and a light are the two upgrades a defensive shotgun cannot do without. Ghost-ring sights or a red-dot rail are the next priority.
Do you need a gunsmith to upgrade a Remington 870?
Rarely. The 870 is one of the most owner-friendly guns to work on: stocks, forends, magazine extensions, sights, lights, shell carriers, and slings all bolt on at home with basic tools. Most 870 receivers are drilled and tapped for an optic rail from the factory. A gunsmith is only needed for tasks like custom barrel work.
How many rounds can a Remington 870 hold with an extension?
A standard 12-gauge 870 holds 4+1 with an 18.5-inch barrel. A two- or three-round magazine extension brings that to roughly 6+1 or 7+1 depending on the tube and shell length, which is a meaningful increase for home defense. Match the extension length to your barrel so the tube does not overhang the muzzle.
Will Mossberg 500 parts fit a Remington 870?
Generally no. The Remington 870 and Mossberg 500 are different platforms with different receiver dimensions, stock threads, forend rails, and magazine tubes, so parts are not interchangeable between them. Always buy parts listed specifically for the Remington 870 (and confirm gauge and barrel length).
Can you put a red dot on a Remington 870?
Yes. Most 870 receivers are drilled and tapped for a Picatinny rail, and many Mesa Tactical shell carriers include an integral rail. Mount a rugged, shotgun-rated red dot on the rail and you gain fast, both-eyes-open aiming that works especially well with buckshot and slugs at defensive distances.
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