Description
The Mossberg Flex 500 20 Ga, 18.5″ Barrel, Pistol Grip Only, Stand-off Muzzle Brake is a purpose-built, compact 20-gauge shotgun designed for close-quarters defense and maneuverability. It combines Mossberg’s proven 500-series reliability with a specialized configuration that prioritizes control in tight spaces, featuring a pistol grip and a barrel just over 18 inches long.
Key Features
- Pistol Grip Only (PGO) Configuration: Maximizes compactness for storage and handling in vehicles or home defense scenarios.
- 18.5″ Barrel with Stand-off Muzzle Brake: The barrel length keeps it legal and maneuverable, while the muzzle brake helps manage 20-gauge recoil and can be used to create distance from a threat.
- Mossberg Flex System: Allows for easy swapping of stocks and forends without tools—though this model ships ready to go as-is.
- Proven 500 Action: You get the same rugged, pump-action reliability that’s been trusted for decades. I’ve put hundreds of shells through various 500s without a hiccup.
- Dual Extractors & Steel-to-Steel Lockup: Built for positive extraction and a solid lockup, which is exactly what you want when it counts.
Specs & Details
| Gauge | 20 Gauge (2 3/4″ & 3″ shells) |
|---|---|
| Barrel Length | 18.5 inches |
| Overall Length | Approx. 28.5 inches |
| Capacity | 5+1 rounds |
| Weight | Approx. 5.5 lbs |
| Choke | Cylinder Bore |
Look, the 20-gauge chambering is a smart choice here. It offers plenty of defensive power with significantly less recoil than a 12-gauge, especially noticeable in a pistol-grip setup. That said, you still need to practice proper technique—it’s not a toy. The stand-off device on the muzzle is a functional touch; it’s not just for looks. It can prevent the barrel from being pushed out of battery if pressed against something, and it does help direct gas to mitigate muzzle rise. This model is drop-in ready and ships with everything you see. At $464.73, it sits in a practical price bracket for a dedicated tool.
Who This Shotgun Is For
This is for the person who needs a compact, no-frills defensive firearm for a vehicle, a small home, or as a dedicated bedside option. It’s also a solid choice for someone sensitive to 12-gauge recoil but who still wants the terminal performance of a shotgun. The PGO setup demands practice, so it’s for someone willing to put in the range time to master the unique handling. Given its configuration, it’s less ideal for hunting or clay sports—this one has a specific job.
Pros & Cons
Pros: Incredibly compact and easy to store. The 20-gauge makes it more manageable for a wider range of shooters. The Mossberg Flex system means you could later add a traditional stock if desired—compatible with other Mossberg 500/590 stocks and forends. The stand-off muzzle brake adds a layer of practical utility. Mossberg reliability is a known quantity.
Cons: Pistol grip shotguns have a steeper learning curve for accurate shot placement. The cylinder bore choke limits effective range. Sling mounts aren’t standard on this configuration, so adding one might require an adapter. It’s a specialist, not a generalist.
Frequently Asked Questions
Q: Is the pistol grip difficult to shoot accurately?
A: It’s different, not difficult—with practice. You won’t be patterning it at 50 yards, but for its intended close-quarters role, it’s effective. The key is a firm, high grip and learning to manage the recoil impulse straight back into your hand. Dry-fire practice is your friend here.
Q: Can I add a shoulder stock to this later?
A: Absolutely. That’s the point of the Flex system. The receiver is drilled and tapped, and the grip is attached via the Flex locking system. You can swap it for a traditional stock from Mossberg or compatible aftermarket brands like Hogue or ATI in minutes with no gunsmithing required.
Q: What ammunition do you recommend for it?
A: For defense, I’ve had good results with Federal Premium Personal Defense 20-gauge loads with FliteControl wads. For practice, any standard 2 3/4″ or 3″ target load will work—just start light to get a feel for it. Remember, an FFL transfer is required for firearm purchases when you order online, including this one.
This Mossberg Flex 500 setup is a focused tool that does its specific job well. It’s available at firearms-missouri.com for Missouri residents and nationwide to compliant states. If a compact, powerful defensive shotgun is what you’re after, this configuration deserves a close look.
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