Description
The Mossberg Flex 500l 12 Ga, 28″ Barrel, Bl/sy 3 Lh is a left-handed, 12-gauge pump-action shotgun built on Mossberg’s proven 500 action. It features a 28-inch vent-rib barrel optimized for field use and hunting, with a synthetic stock and a matte black finish. The ‘Flex’ system allows for tool-free stock and forend swaps, offering customization for different roles without gunsmithing required. This model is specifically configured for left-handed shooters, providing a natural, ergonomic control layout.
Key Features
- Left-Handed Configuration: Safety and slide release positioned for intuitive left-hand operation.
- Mossberg Flex System: Tool-free interchangeability of stocks and forends to adapt the shotgun from field to tactical use.
- 28″ Vent-Rib Barrel: Provides a long sight plane for improved accuracy on clays and upland game.
- Dual Action Bars: Ensures smooth, reliable pumping and reduces binding under heavy use.
- Ambidextrous Tang Safety: Easily accessible safety switch located on the top rear of the receiver.
- Blued Finish & Synthetic Stock: Offers durable corrosion resistance and weatherproof handling in all conditions.
Specifications & Details
| Gauge | 12 Gauge |
| Chamber | 3″ |
| Barrel Length | 28″ |
| Overall Length | Approx. 48.5″ |
| Weight | Approx. 7.5 lbs |
| Capacity | 5+1 (with included plug) |
When it comes to a full day in the field, the weight distribution of this 7.5-pound platform helps manage recoil and reduces shooter fatigue. The 28-inch barrel is the sweet spot for swing dynamics on moving targets like dove or pheasant. It’s a workhorse built on a platform known for reliability—the same core action trusted by military and law enforcement. The synthetic stock shrugs off moisture and rough handling, which is crucial when you’re pushing through a Missouri creek bottom. At $376.65, it represents a significant value for a dedicated left-handed field gun with customization potential. Available at firearms-missouri.com for Missouri residents and nationwide.
Who It’s For
This shotgun is engineered for the left-handed hunter and sport shooter. It’s for the southpaw who’s tired of adapting to right-handed controls or dealing with ejected shells crossing their sight line. It’s also a solid choice for a left-handed shooter looking for a single, adaptable platform that can serve as a waterfowl gun one season and, with a stock swap, a capable home defense tool the next. The Flex system means your investment can evolve with your needs.
Pros & Cons
Pros: True left-handed ergonomics eliminate a major training hurdle. The proven Mossberg 500 reliability is built in. The Flex system offers genuine, drop-in ready customization without a gunsmith. The 28″ barrel is versatile for clays, turkey, and upland birds. The price point is competitive for a specialized configuration.
Cons: The long barrel is not ideal for tight-quarters home defense without a stock/barrel swap. Synthetic stock may feel less premium than wood to some shooters. As a specialized left-hand model, aftermarket support for certain components may be narrower than for standard right-handed 500s.
Frequently Asked Questions
Q: Is the ‘Flex’ system compatible with all Mossberg 500 parts?
A: It is compatible with the extensive line of Mossberg-branded Flex stocks, forends, and conversion kits. Many standard Mossberg 500 barrels will also fit, but always verify compatibility for your specific model and gauge. The system is designed for user-level swaps.
Q: Can a right-handed person use this shotgun effectively?
A: They can, but it’s not optimal. The primary advantage—left-handed controls—becomes a disadvantage for a right-handed shooter. The safety and slide release will be awkward to manipulate quickly. Right-handed shooters should seek a standard configuration.
Q: What is the chamber length, and what shells can it fire?
A: The chamber is 3 inches. This means it can safely fire standard 2 3/4″ shells, powerful 3″ magnum loads, and the shorter 2 3/4″ shells. Always use ammunition appropriate for your barrel’s choke and your intended game. The 5+1 capacity is typical for a field model using a plug to comply with migratory bird regulations.
Here’s the thing—finding a dedicated left-handed shotgun at this price that doesn’t force compromises on reliability or future customization is rare. This Mossberg Flex 500l delivers that. If you’re a left-handed shooter building your kit for the field, this platform gives you a proven starting point with room to grow. Check availability and initiate your FFL transfer through our site.
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