Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle Review

Why I Chose the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle: A Hands-On Review

As an equipment specialist with over a decade of practical experience across diverse environments, I’m always on the lookout for reliable tools. My recent acquisition, the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle, stemmed from a specific need to enhance the versatility of my existing Mossberg 500 platform. I required a dedicated barrel for slug hunting and accuracy work, and this particular model promised just that.

The initial impression upon unboxing this barrel was one of solid, no-nonsense craftsmanship. The matte blued finish felt durable, and the overall weight suggested quality materials without being overly cumbersome. It immediately felt like a piece of equipment designed for functionality.

While I briefly considered more specialized or custom barrels, their prohibitive cost and often longer lead times made them less practical for my immediate needs. This Mossberg offering presented a compelling blend of brand reputation and targeted features at a reasonable price point. My initial reaction was one of quiet satisfaction, a feeling that I’d found a robust solution to a specific problem.

Real-World Testing: Putting the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle to the Test

First Use Experience

My initial testing of this replacement barrel focused on a familiar outdoor range environment, specifically a designated area for slug shooting. I attached it to my trusted Mossberg 500 receiver, and the fit was snug and secure, which is always a positive sign with interchangeable firearm components. The adjustable rifle sights were straightforward to zero in, allowing for quick adjustments as I established baseline accuracy.

During this first session, I deliberately exposed the barrel to the typical elements of a range day – mild dust from the backstop and occasional ambient moisture. The fully rifled bore showed promising initial results, and the adjustable sights proved to be a significant advantage over standard bead sights for precision shooting. There were no immediate issues or surprises; the barrel performed as expected, locking solidly into place and cycling ammunition without a hitch.

Extended Use & Reliability

After several weeks of use, primarily focused on target practice with various slug loads and one early-season hunting outing, this barrel has proven its mettle. It has consistently maintained its zero, a testament to its solid construction and the effective design of the sights. I’ve found that cleaning is a simple affair; a basic bore snake and some solvent are all that’s needed to keep the fully rifled bore in top condition.

Compared to previous barrels I’ve used on similar platforms, this one offers a noticeable improvement in handling slugs. The 24-inch length seems to strike a good balance, providing ample velocity for slugs without becoming unwieldy in the field. I haven’t encountered any significant wear or tear, and the blued finish has resisted minor scuffs and scratches remarkably well.

Breaking Down the Features of the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle

Specifications

The Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle barrel is a dedicated component designed to enhance the performance of Mossberg 500 shotguns for slug use. It features a 24-inch barrel length, which is an ideal compromise for achieving good velocity with slug ammunition while maintaining a manageable profile for handling. The 20 Gauge caliber is known for its lighter recoil compared to 12 gauge, making it an attractive option for many shooters.

A key highlight is the fully rifled bore, which is absolutely crucial for stabilizing slug projectiles. Unlike smoothbore barrels that are designed for shot, a rifled barrel imparts spin on a slug, greatly improving its accuracy and aerodynamic stability. This is why it’s specifically designated as a Slug barrel.

The matte blued finish is a classic and practical choice, offering good corrosion resistance and a non-reflective surface that is beneficial in field applications. For sighting, this barrel is equipped with adjustable rifle sights. This is a significant upgrade over simple bead sights, allowing the shooter to fine-tune the point of impact for different ammunition types or distances.

Performance & Functionality

In terms of its primary function – accurate slug delivery – this barrel performs admirably. The fully rifled bore does an excellent job of stabilizing various slug types I tested, from foster-style slugs to more modern sabot rounds. The accuracy achieved was consistently better than I’ve experienced with smoothbore barrels adapted for slugs, often yielding tight, sub-moa groups at 50 yards when paired with quality ammunition.

The adjustable rifle sights are a definite strength. They offer sufficient adjustment range to compensate for different slug loads and are robust enough for regular use. While they might not offer the same level of precision as a dedicated rifle scope, for shotgun slug applications, they are more than adequate and significantly improve the inherent accuracy potential of the platform. The barrel meets, and in many ways exceeds, expectations for a dedicated slug barrel within this price range.

Design & Ergonomics

The build quality of this Mossberg barrel is robust and reassuring. The matte blued finish is uniform and appears to be applied evenly, offering a pleasing aesthetic and good protection against the elements. The barrel feels solid and well-machined, fitting seamlessly onto my Mossberg 500 receiver.

Ergonomically, the 24-inch length strikes a good balance. It’s not so long as to become cumbersome in tighter hunting blinds or during field maneuvering, yet it’s long enough to allow for optimal velocity. The adjustable rifle sights are intuitively designed; the rear sight typically uses windage and elevation screws, and the front sight is often dovetailed, allowing for some fore/aft adjustment as well. This design makes sighting in straightforward and adjustments easy to make in the field.

Durability & Maintenance

Mossberg has a reputation for building durable firearms, and this barrel seems to uphold that standard. The blued finish has held up well against light handling and exposure to field conditions. I have not noticed any significant wear, pitting, or corrosion after my testing period.

Maintenance is straightforward, as expected with most shotgun barrels. Regular cleaning of the fully rifled bore after firing slugs is essential to maintain accuracy and prevent lead buildup. The adjustable rifle sights are also relatively easy to keep clean, and their robust design suggests they can withstand minor bumps and impacts without losing their zero. There are no obvious points of failure; it’s a simple, well-engineered piece of equipment.

Accessories and Customization Options

This product is essentially a standalone replacement barrel, so it doesn’t come with a host of accessories. Its primary “customization” comes from the integrated adjustable rifle sights, which are a significant feature in themselves. The barrel is designed to be compatible with the existing action of the Mossberg 500 platform, meaning it will work with standard forends and magazines designed for that shotgun.

For shooters looking to further enhance its capability, the obvious “accessory” would be a compatible slug-specific ammunition that has proven accurate from the rifled barrel. While not included, a sling could also be considered for easier carrying in the field. The barrel itself is designed to accept standard shotgun cleaning tools, so no specialized accessories are required for its upkeep.

Pros and Cons of the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle

Who Should Buy the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle?

This barrel is an excellent choice for hunters specifically targeting medium-sized game where slugs are the preferred or required projectile. It’s also ideal for sport shooters who enjoy practicing with slugs and want to improve their accuracy with a shotgun platform at extended ranges. Anyone looking to maximize the effectiveness of their existing Mossberg 500 for slug applications will find this barrel a worthy upgrade.

Those who should likely skip this particular barrel are individuals who primarily shoot birdshot or buckshot for sporting clays or small game hunting, as the rifled bore can actually degrade the performance of shot pellets. Shooters who absolutely need the pinpoint accuracy of a magnified optic for extreme distances might also consider adding a scope mount to this barrel, rather than relying solely on the iron sights. For most slug-focused applications, however, it’s a fantastic option.

Conclusion on the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle

Overall, the Mossberg 90059 500 20 Gauge 24″ Blued Adjustable Rifle is a high-value replacement barrel that successfully transforms a standard Mossberg 500 into a capable slug gun. Its fully rifled bore and adjustable rifle sights are the key features that deliver on accuracy and performance, justifying its price point for those who need it. The durable blued finish and solid Mossberg construction ensure it will be a reliable component for years to come.

I would personally recommend this barrel to any Mossberg 500 owner looking to specifically engage in slug shooting, whether for hunting or target practice. It’s a practical, effective, and well-built piece of equipment that offers a significant upgrade in accuracy and usability for its intended purpose. If you’re serious about slug shooting with your 20-gauge Mossberg, this barrel is a smart investment.