Mossberg FLEX 500 All Purpose 12ga Pump-Action Shotgun - Black (Model 50121)

The Mossberg FLEX 500 all-purpose 12-gauge pump-action shotgun is built for hunters and shooters who need one gun to handle whatever the day throws at them. This model (50121) comes with a matte blued 28-inch vent rib ported barrel topped with a twin-bead sight system, giving you flexibility for upland game, waterfowl, or clay shooting. The 3-inch chamber and 6-round capacity make it practical for hunting applications, while the Accu-Set choke system lets you fine-tune your shot pattern without swapping barrels. Weighing 7.5 pounds and measuring 48.25 inches overall, it's balanced enough for extended days afield yet substantial enough to manage recoil from 12-gauge loads. The synthetic black stock and fore-end stand up to weather and rough handling, making this a working gun for the real world.

What makes the FLEX 500 stand out in the pump-action shotgun market is its reputation for reliability at a practical price point. Mossberg's twin-bead sight arrangement helps you track moving targets, while the ported barrel reduces recoil impulse and muzzle rise—a genuine advantage when you're cycling rounds quickly or shooting all day. The fixed length of pull (14.25 inches) suits most adult shooters comfortably; the gun points naturally and doesn't feel cramped or stretched. Whether you're a first-time shotgun buyer or adding a versatile 12-gauge to your collection, the FLEX 500 delivers honest performance without unnecessary frills.

This is a no-nonsense shotgun that works. It's not a race gun, and it's not a safe-queen collectible. It's the kind of tool that shows up, does the job, and asks for basic maintenance in return. If you hunt upland birds, work waterfowl over decoys, or simply want a reliable 12-gauge for the range, the FLEX 500 is worth your attention.

Key Features

• 3-inch chamber and 6-round capacity for hunting versatility
• 28-inch vent rib ported barrel reduces recoil and muzzle rise
• Twin-bead sight system for reliable target acquisition
• Accu-Set interchangeable choke system for pattern adjustment
• Synthetic black stock and fore-end resist weather and wear
• 7.5-pound weight balanced for all-day handling

Specifications

Frequently Asked Questions

What is the Mossberg FLEX 500 best used for?

The FLEX 500 is an all-purpose 12-gauge suited to upland hunting, waterfowl work, sport shooting, and general range use. The 3-inch chamber and 6-round capacity make it practical for hunting scenarios, while the twin-bead sight and ported barrel help control recoil during extended shooting sessions.

Does the FLEX 500 come with chokes, and can I use different loads?

The shotgun features an Accu-Set interchangeable choke system that allows you to adjust your shot pattern for different hunting conditions. The 3-inch chamber accommodates standard 2.75-inch shells and 3-inch magnum loads, giving you flexibility in ammunition selection.

What's the length of pull, and will it fit me?

The FLEX 500 has a fixed length of pull of 14.25 inches, which fits most adult shooters comfortably. This measurement is from the trigger to the back of the stock, so if you're average-sized or larger, the gun should point naturally for you.

What does the ported barrel do?

The 28-inch vent rib ported barrel reduces recoil impulse and muzzle rise, making the gun more manageable when you're shooting multiple rounds or working with heavier loads. The twin-bead sight sits atop the rib, giving you a steady reference for tracking targets.