Best Mossberg 500 and 590 Upgrades for Tactical Performance & Home Defense

The Mossberg 500 and 590 shotguns have earned their reputation through decades of hard use and proven performance in combat zones worldwide. These pump-action powerhouses offer amazing upgrade potential for anyone looking to improve their home defense setup or tactical capabilities.

If you want to take your Mossberg to the next level then you've come to the right place. This guide covers 13 of the best upgrades that transform an already great shotgun into something truly exceptional. From better sights to improved controls, these modifications make a real difference when seconds count.

Let's jump into the best ways to upgrade your Mossberg 500 or 590 shotgun for tactical and defensive applications.

Once your Mossberg is set up with the right upgrades, choosing quality ammunition is the next step. We’ve broken down the best 12 gauge shotgun shells for defense and hunting to help you decide.

Top Mossberg 500 and 590 Upgrades

1. Holosun 507C X2 – Best Red Dot for Precision & Speed

The Holosun 507C X2 stands out as the perfect red dot option for your Mossberg shotgun. This compact optic features a smart multi-reticle system that gives you options based on your specific needs. The standout feature is the 32 MOA circle reticle that helps you visualize your buckshot pattern at defensive distances.

Many users pair the 507C with Federal FliteControl loads to create a deadly accurate system, though different shotguns pattern differently.. By patterning their loads at common defensive distances (5, 10, and 15 yards), they can ensure all pellets stay within that 32 MOA circle. This means complete accountability for every projectile – a crucial factor in home defense situations.

The optic mounts easily to most Mossberg shotgun receiver rails or dedicated mounts like the CROM or CoSight (both covered later in this article). Its RMR footprint makes it compatible with a wide range of mounting options already on the market.

Built tough enough to handle the punishing recoil of 12-gauge loads, the 507C features solar backup power and extremely long battery life. The auto-brightness feature adjusts to your environment.  Therefore it makes this optic ready for any lighting condition you might face during a defensive encounter.

Price: $309

Features

• Multi-reticle system (dot, circle, circle-dot)
• 32 MOA circle ideal for buckshot patterning
• Long battery life with solar backup
• RMR footprint for compatibility

Pros

• Excellent for precision with shotguns
• Rugged and durable design
• Easy to zero and holds zero under recoil
• Multiple reticle options for different scenarios

Cons

• Smaller window than some shotgun-specific optics
• May require riser or mount for optimal alignment

2. Magpul M-LOK Vertical Grip – Compact Grip for Better Control

Adding a vertical grip to your Mossberg's forend transforms how you control the shotgun during rapid firing and reloading. The Magpul M-LOK Vertical Grip gives your support hand something substantial to hold onto, dramatically reducing the chance of short-stroking the action during high-stress situations.

For defensive situations, this grip creates the perfect platform for the push-pull technique – pushing forward with your firing hand and pulling back with your support hand. This method tames recoil and speeds up follow-up shots. The vertical orientation gives your hand a mechanical advantage that a standard pump grip can't match.

The compact size of this grip makes it ideal for maneuvering in tight spaces like hallways or doorways. It doesn't snag on clothing or doorframes but still provides enough surface area for a solid grip. The textured surface stays secure even with sweaty hands or gloves.

Installation is straightforward on any Magpul MOE forend (also on our list). The direct M-LOK attachment means there's no chance of the grip sliding or shifting during use – a common problem with grip sleeves or strap-on accessories. For users with pistol-grip Mossberg configurations, this vertical grip becomes even more important for proper control and shot placement.

Price: $21.80

Features

• Low-profile M-LOK design
• Lightweight polymer construction
• Ergonomic shape
• Easy to install

Pros

• Improves recoil management
• Prevents hand slippage
• Enhances tactical reload control
• Creates better push-pull control

Cons

• May be too short for users with large hands
• Only compatible with M-LOK forends

3. Aridus Industries Q-DC – Detachable Shell Carrier System

The Aridus Industries Q-DC revolutionizes how you carry spare ammunition on your shotgun. Unlike traditional side saddles that become useless once emptied, this innovative system features detachable carriers that can be swapped out in seconds during a reload. This means you're never stuck with an empty shell holder on your gun.

Made from precision-machined aluminum with spring-loaded shell retention, the Q-DC holds shells more securely than any other side saddle on the market. The robust retention system keeps shells in place regardless of position or movement – even when stored upside down. This level of security inspires confidence in dynamic situations where losing ammunition could be catastrophic.

The universal model attaches via an extremely strong adhesive pad that creates a bombproof bond with your receiver. This eliminates the need to remove receiver pins or deal with screws that might back out over time. For those who prefer a mechanical attachment, bolt-on models are also available for specific shotgun models.

Each carrier holds six shells and fits perfectly in standard AR-15 magazine pouches or dedicated carriers from companies like Wilderness Tactical. The ability to pre-load multiple carriers means you can customize shell loads for different scenarios – perhaps slugs in one carrier and buckshot in another – and swap between them as needed.

Price: $185 

Features

• Six-shell detachable carriers
• Compatible with AR mag pouches
• Aluminum construction with spring retention
• Adhesive or bolt-on installation options

Pros

• Extremely durable
• Fast reloading with detachable carriers
• Shells remain secure even upside down
• No tools needed for carrier swaps

Cons

• Expensive compared to other side saddles
• Adhesive mount may not suit all preferences

4. OPSol Mini Clip 2.0 – Mini Shell Adapter for More Capacity

The OPSol Mini Clip 2.0 might be the most affordable yet impactful upgrade on this list. This small rubber adapter fits into the rear of your Mossberg 500/590 receiver and solves a common problem: the inconsistent feeding of mini shells. Without this adapter, mini shells tend to flip, rotate, or jam when cycling through the action.

Mini shells, like those made by Aguila, measure just 1¾ inches compared to standard 2¾-inch shells. This size difference allows you to substantially increase your shotgun's capacity – often up to 8-9 rounds in a standard 5-round tube. For defensive scenarios, that extra capacity could make a critical difference without requiring extended tubes or modifications.

Installation takes seconds and requires zero tools or permanent modifications. Simply drop the adapter into place, and you're ready to load mini shells. The beauty of this system is its temporary nature – when you want to switch back to standard shells, just pop out the adapter. This flexibility adds tremendous value.

For Mossberg Shockwave owners, this adapter is particularly game-changing. The increased capacity combined with the already compact Shockwave format creates an incredibly potent defensive package. The reduced recoil of mini shells also makes the Shockwave substantially more controllable, especially for smaller-framed users.

Price: $15.95

Features

• Drop-in installation
• No permanent modification required
• Works with Aguila mini shells
• Lightweight polymer build

Pros

• Nearly doubles capacity in some setups
• Makes mini shells feed properly
• Great value for the price
• Easy to install and remove

Cons

• Only compatible with Aguila mini shells
• Not necessary for standard 2.75" shells

5. Tactaload Flash 5 Stock – Shell Storage Built into the Stock

The Tactaload Flash 5 Stock takes a unique approach to spare ammunition storage by integrating it directly into the shotgun's stock. This innovative design stores five shotgun shells inside the stock itself, protecting them from the elements and keeping them secure until needed. Unlike exposed side saddles, these shells stay clean and ready for use.

The genius of this system lies in its spring-loaded shell dispenser. When you need a reload, simply pull a shell from the stock and the spring-loaded nub retracts, presenting the next shell automatically. This creates a smooth, intuitive reloading process that works equally well for right- or left-handed shooters. The Flash 5 Stock’s clever design also keeps shells from rattling or making noise while you move.

Beyond ammunition storage, the Flash 5 functions as an excellent stock in its own right. It features adjustable length-of-pull options similar to the popular Magpul SGA stock, allowing users of different sizes to customize fit for maximum comfort and control. The ergonomic shape provides a solid cheek weld and comfortable recoil pad.

The stock's construction strikes an ideal balance between weight and durability. Strong enough to withstand hard use but not so heavy as to unbalance the shotgun, it maintains the Mossberg's excellent handling characteristics. The quick-access shell storage makes this an ideal option for home defense where extra ammunition should be readily available but not exposed.

Price: $130

Features

• Internal spring-loaded storage for 5 shells
• Ambidextrous access
• Adjustable length of pull
• Tough polymer build

Pros

• Streamlined storage solution
• Quick reloads directly from stock
• Comfortable and secure grip
• Adjustable to fit different users

Cons

• Replaces standard stock completely
• May not appeal to traditionalists

6. Defender Tactical CoSight – Low-Mount Red Dot & Backup Sight Solution

The Defender Tactical CoSight addresses a common problem with shotgun optics mounting: excessive height over bore. Most rail-mounted dots sit too high, creating an awkward cheek weld and slower target acquisition. The CoSight dramatically lowers the optic's position by directly attaching to the shotgun without bulky rails.

This CNC-machined mount accepts any optic with an RMR footprint (including the Holosun 507C mentioned earlier). By eliminating intermediate mounting hardware, it reduces the chances of screws loosening or mounts shifting under recoil. This direct-mounting system creates a rock-solid platform that maintains zero through thousands of rounds.

The truly innovative aspect of the CoSight is its built-in Glock sight dovetails. These allow you to install standard Glock-pattern sights both in front of and behind your red dot. This creates a backup sighting system that doesn't require co-witnessing through the optic itself – a more practical solution for the shotgun platform. Even if your red dot fails completely, you can still aim using these backup sights.

Installation requires minimal tools and modest technical skills. Once mounted, the CoSight maintains a clean, snag-free profile that works well in defensive scenarios where you can't afford to have gear catching on door frames or furniture. For those with ghost ring sights, the CoSight can replace the rear sight while allowing the front sight to remain intact.

Price: $99 

Features

• Direct RMR footprint mounting
• Front and rear Glock sight compatibility
• Low-profile aluminum construction
• Simple installation process

Pros

• Allows backup iron sights with red dot
• Eliminates need for bulky picatinny rails
• Maintains consistent cheek weld
• Snag-free design

Cons

• Short sight radius for iron sights
• Designed primarily for red dot users

7. XS Big Dot Front Sight – High-Visibility Night Sight

The XS Big Dot Front Sight transforms the standard bead sight on your Mossberg into a high-visibility aiming point that works in any lighting condition. This large, tritium-powered front sight is significantly easier to pick up in low light than a standard bead – crucial for home defense scenarios that often happen in darkness or dim light.

The oversized white dot surrounding the tritium vial creates instant visual acquisition during daylight hours. Your eye naturally finds and focuses on this large, high-contrast dot faster than a traditional bead. This speed advantage matters in defensive situations where fractions of a second make a difference.

Installation is straightforward – the sight screws directly into the same threads as your factory bead. No gunsmithing or special tools are required. Many users report completion in under five minutes with basic tools. The robust construction ensures the sight stays in place, even after thousands of rounds of heavy 12-gauge loads.

For users who also run red dot optics, the XS Big Dot sits high enough to co-witness with many receiver-mounted optics. This provides redundancy – if your electronic sight fails, the glowing front sight gives you an immediate backup option. The combination of electronic and tritium-powered sights creates an extremely effective 24/7 sighting system.

Price: $64

Features

• Tritium-powered night visibility
• Fits standard Mossberg bead threads
• Co-witness capability with optics
• Durable steel housing

Pros

• Glows in low-light situations
• Very fast front sight acquisition
• Pairs well with red dot optics
• No batteries needed

Cons

• Requires bead sight removal
• Some users may prefer traditional bead

8. Blue Force Gear Vickers Sling – Adjustable Two-Point Sling

The Blue Force Gear Vickers Sling has earned its reputation as the gold standard for tactical shotgun slings. Designed by Larry Vickers, a former Delta Force operator, this sling incorporates lessons learned from decades of real-world combat experience. Its standout feature is the rapid adjustment tab that allows instant changes to sling tension.

This quick-adjust capability lets you transition seamlessly between different carry positions and shooting stances. If you need to climb, crawl, or run then simply tighten the sling with a quick pull. If you are ready to shoot then loosen it instantly for full mobility. This flexibility proves invaluable in dynamic defensive scenarios where your needs change moment to moment.

The sling's construction features heavy-duty nylon webbing and hardware designed to last through years of hard use. The materials strike a perfect balance – sturdy enough to trust your shotgun to, yet not so stiff or bulky as to become uncomfortable during extended wear. The edges are sewn to prevent fraying even after thousands of adjustments.

Installation requires mounting points on your Mossberg, which can be added via stock attachments or receiver mounts if not already present. The standard Vickers Sling uses 1.25" webbing – an ideal width for distributing the weight of a loaded shotgun without digging into your shoulder or neck during extended carry periods.

Price: $55

Features

• Two-point sling design
• Quick-adjust slider
• Multiple color options
• Heavy-duty hardware

Pros

• Instantly adjustable on the fly
• Durable and long-lasting
• Enhances shotgun control
• Comfortable for extended wear

Cons

• Only supports two-point configuration
• May require sling mounts or adapters

9. Magpul MOE Shotgun Forend – Modular Pump Upgrade

The Magpul MOE Shotgun Forend revolutionizes how you accessorize your Mossberg's pump action. Unlike the factory forend, this replacement pump features M-LOK slots on multiple surfaces, creating a modular platform for attaching lights, vertical grips, and other accessories directly to the pump without bulky adapters or bands.

Ergonomics see a major improvement with the MOE forend. The textured surface provides a secure grip even with wet hands or gloves, reducing the chance of slipping during rapid pump cycling. The slight palm swells create a more natural hand position that reduces fatigue during extended training sessions or competitions.

A key advantage of the MOE design is that it doesn't overlap the receiver, leaving plenty of clearance for side-mounted shell carriers. This compatibility with side saddles makes it ideal for tactical setups where quick access to spare ammunition matters. The clean interface between forend and receiver also prevents pinching during operation.

Installation on standard Mossberg shotguns is straightforward and requires only basic tools. For short-barreled models or Shockwave variants, users have two options: carefully modify the forend with a Dremel tool or purchase an adapter from Hogue. Either solution allows this excellent forend to fit virtually any Mossberg 500/590 variant.

Price: $28

Features

• M-LOK and MOE slot compatibility
• Lightweight polymer construction
• Optional rail sections available
• Designed specifically for Mossberg 500/590

Pros

• Adds customization potential
• Excellent grip texture
• Doesn't interfere with side saddles
• Better ergonomics than factory pump

Cons

• Requires adapter or modification for short action tubes
• Slight learning curve for installation

10. Aridus SMRT Follower – Magazine Feeding Improvement

The Aridus SMRT Follower might seem like a small upgrade, but it solves a critical function in your Mossberg shotgun. The follower – that little piece at the end of your magazine spring – plays a huge role in feeding. A poorly designed follower can tilt, bind, or cause malfunctions that render your shotgun useless when you need it most.

Aridus Industries engineered the SMRT follower with feeding geometry that promotes smooth, consistent shell presentation. This becomes especially important when using magazine extensions, where factory followers often create reliability issues. The precision-machined design eliminates binding points and ensures the follower rides straight in the tube.

The high-visibility green base serves a practical purpose beyond looks – it creates both visual and tactile indicators when your magazine is empty. You can feel when you've reached the follower during a reload, even in complete darkness. This tactile feedback speeds up reloading by eliminating the need to visually check if the tube is empty.

Installation takes just minutes with no special tools required. Simply remove your magazine cap, spring, and old follower, then replace with the SMRT follower and reassemble. This simple upgrade provides immediate improvements in feeding reliability without changing your shotgun's appearance or manual of arms.

Price: $40

Features

• High-vis green follower base
• Tactile design for empty mag tube detection
• Compatible with extended tubes
• Durable construction

Pros

• Reduces feeding issues
• Easy to identify empty tube
• Maintenance-free upgrade
• Works with factory and aftermarket extensions

Cons

• Pricey for a small part
• No added capacity—only improves function

11. Nightstick Shotgun Forend Light – Integrated Weapon Light

The Nightstick Shotgun Forend Light offers an elegant solution to mounting a tactical light on your Mossberg. Rather than attaching a separate light to rails or bands, this unit replaces your entire pump forend with an integrated light system. The result is a streamlined package with no snag points or additional bulk.

Boasting an impressive 1,200 lumens backed by 10,315 candela, this light delivers both flood and throw – illuminating an entire room and reaching out to identify threats at distance. The beam pattern is optimized for tactical use, with a bright central hotspot surrounded by enough spill to maintain situational awareness of your surroundings.

Activation comes via large, ambidextrous buttons positioned for intuitive use under stress. These buttons can be pressed with either momentary or constant-on activation depending on your needs. The textured, rubberized surface of the forend provides excellent grip even when wet, and an optional retention strap ensures your hand stays in place during rapid manipulation.

The adaptable mounting system makes this light compatible with both standard Mossberg shotguns and shorter variants like the Shockwave. Power comes from two CR123 batteries housed within the forend itself, with a runtime sufficient for multiple defensive scenarios. For those wanting additional options, models with integrated lasers are also available.

Price: $149

Features

• 1,200-lumen white light
• 10,315 candela output
• Optional red laser model available
• Strap and textured grip included

Pros

• Powerful and room-filling light
• Easy access ambidextrous controls
• Durable and compact design
• No separate mounting needed

Cons

• Newer product with limited long-term data
• Slightly bulkier than standard forends

12. Aridus Industries CROM – Co-Witness Red Dot Mount

The Aridus Industries CROM (Co-witness Ready Optic Mount) represents the peak of shotgun optics mounting technology. Designed specifically for Mossberg shotguns equipped with ghost ring sights, this mount replaces your rear sight assembly with a precision-machined platform for mounting red dot optics.

What sets the CROM apart is its ability to maintain your backup sighting options. Behind the optic sits your choice of a traditional ghost ring or a Rob Haught-style open rear sight. This creates true co-witnessing capability – if your red dot fails, you still have fully functional iron sights without needing to remove anything from the gun.

The mount positions your optic at an ideal height for a natural cheek weld on the shotgun stock. This proper alignment speeds up target acquisition and reduces fatigue during extended shooting sessions. By keeping the optic close to the bore axis, the CROM also minimizes the need to compensate for height-over-bore at close ranges.

Installation is straightforward for anyone comfortable with basic gunsmithing tasks. The CROM replaces your factory rear sight assembly and accepts any optic with a Trijicon RMR footprint (including options from Holosun, Swampfox, and others). The machined aluminum construction creates a rock-solid mounting solution that maintains zero even under the punishing recoil of magnum shotgun loads.

Price: $124

Features

• Trijicon RMR footprint
• Replaces rear ghost ring
• Allows co-witness with Rob Haught rear or ghost ring
• Precision-machined aluminum

Pros

• Co-witnesses red dot and iron sights
• Strong and lightweight
• Maintains consistent cheek weld
• Perfect height for shotgun ergonomics

Cons

• Only works with ghost ring setups
• Not ideal for bead sight users

13. Magpul SGA Stock – Adjustable, Ergonomic Tactical Stock

The Magpul SGA Stock has become the industry standard for tactical shotgun stocks – and for good reason. It addresses the primary complaint about factory shotgun stocks: their fixed length of pull that's too long for many users, especially when wearing body armor or tactical gear. The SGA solves this with an adjustable design that fits nearly any shooter.

Adjustment happens via removable spacers that allow the length of pull to vary from 12.3 to 14.3 inches. This customization ensures proper fit regardless of your body size or gear setup. A proper fit translates directly to better recoil management, faster target transitions, and reduced fatigue during extended use.

The SGA combines the best aspects of traditional and pistol grip stocks. It maintains the classic shotgun mounting position, but adds a steeper grip angle that provides better control and a more natural wrist position. This hybrid design allows for one-handed control when necessary without sacrificing the traditional shotgun manual of arms.

Beyond ergonomics, the SGA includes practical features like multiple sling mounting points and an optional cheek riser for use with raised optics. The rubber buttpad effectively soaks up recoil from even the heaviest loads. The durable polymer construction shrugs off the bumps and scrapes inevitable during hard use.

Price: $109

Features

• LOP adjustable from 12.3 to 14.3 inches
• Sling attachment points
• Optional cheek riser attachments
• Polymer body with rubber butt pad

Pros

• Great for different shooter sizes
• Improves handling and comfort
• Extremely rugged construction
• Compatible with most shooting styles

Cons

• Pricier than basic stocks
• Heavier than standard plastic stocks

Conclusion

The Mossberg 500 and 590 shotguns provide an excellent foundation for building the ultimate tactical or home defense weapon. With the right combination of these upgrades, you can create a shotgun that perfectly matches your specific needs and preferences.

Consider your use case carefully when selecting modifications. Home defense users might prioritize illumination, sight upgrades, and ammunition capacity. Those building patrol or duty shotguns might focus more on sling options, shell carriers, and stock adjustability.

No matter which upgrades you choose, remember that training with your modified shotgun is essential. The best gear in the world can't replace practice and familiarity with your weapon system.

If you’re still weighing your options, take a look at our breakdown of the top 5 shotguns for home defense. You’ll see how these Mossbergs stack up against other pump-action and semi-auto favorites.

Frequently Asked Questions

Which upgrade should I install first on my Mossberg 500/590?

Start with comfort and usability upgrades like the Magpul SGA stock or MOE forend. These improve how the shotgun fits you and makes other upgrades more effective. For home defense, a good weapon light should also be high on your priority list.

Do these upgrades affect the Mossberg's famous durability?

No. In fact, many of these upgrades come from companies that supply military and law enforcement agencies. Products from Magpul, Aridus Industries, and Blue Force Gear are designed to enhance durability, not compromise it.

Can I install these upgrades myself or do I need a gunsmith?

Most of these upgrades can be installed at home with basic tools and mechanical skills. The stock, forend, sling, and mini-clip adapter are particularly easy DIY projects. For optics mounting, some users may prefer professional installation, but detailed instructions make even these manageable for most.

Will adding accessories make my shotgun too heavy?

Modern accessories are designed with weight in mind. Polymer components from Magpul actually weigh less than some factory parts. Even with a red dot, light, and loaded side saddle, your shotgun should remain manageable. Focus on only adding what serves a purpose for your specific needs.

How much should I budget for upgrading my Mossberg shotgun?

You can make meaningful improvements for as little as $50-100 with upgrades like the OPSol mini-clip or XS Big Dot sight. A complete overhaul with premium components (stock, forend, optic, light, etc.) typically runs $400-600. Prioritize based on your needs and budget accordingly.

Are these upgrades legal in all states?

Most upgrades discussed here are legal nationwide, but always check your local laws. Some states have restrictions on magazine capacity that might affect accessories like magazine extensions. Certain configurations might also impact NFA rules, particularly for Shockwave models.