Description
Mossberg 590 Shockwave SPX 12 Gauge Pump Shotgun
The Mossberg 590 Shockwave SPX 12 Gauge Pump Shotgun is a compact, purpose-built platform designed for close-quarters handling and rugged reliability. It features the Shockwave Raptor bird’s-head grip, a heavy-walled barrel with heat shield and breacher muzzle, and retains Mossberg’s proven controls including an ambidextrous top tang safety, dual extractors, twin action bars, and a smooth anti-jam elevator. The SPX configuration adds a receiver-mounted side saddle with polymer shellholders and a removable top rail for optics or accessories.
| Manufacturer | Mossberg |
|---|---|
| Model | 590 Shockwave SPX |
| Material | Steel barrel, polymer grip and forend |
| Compatibility | 12-gauge 2 3/4-inch and 3-inch shells (per manufacturer specs) |
| Finish | Matte blued barrel, black anodized receiver |
| Weight | 5.5 pounds (unloaded, per Mossberg specs) |
| Condition | New |
Key Features
- Shockwave Raptor Grip: Why it matters — this bird’s-head grip improves one-handed control and maneuverability, making the shotgun easier to handle for smaller-framed shooters or those new to pump actions.
- Heavy-Walled Barrel with Heat Shield & Breacher Muzzle: Why it matters — the heavy barrel reduces muzzle rise during rapid fire, the heat shield protects your hand during extended strings, and the breacher muzzle can be used to open doors or break glass in an emergency.
- Receiver-Mounted Side Saddle: Why it matters — this polymer shellholder adds six extra rounds directly on the gun, allowing faster reloads without digging into pockets or pouches.
- Ambidextrous Top Tang Safety: Why it matters — the safety is easy to reach for both left- and right-handed shooters, and its location on top of the receiver makes it intuitive even under stress.
- Removable Top Rail: Why it matters — you can mount a red dot, reflex sight, or other optics to improve target acquisition speed, especially for newer shooters who benefit from a clear aiming point.
Who It’s For
The Mossberg 590 Shockwave SPX is ideal for home defenders who want a compact, easy-to-store shotgun that doesn’t sacrifice capacity or reliability. It’s also a great choice for range enthusiasts who enjoy the challenge of shooting a short-barreled pump action. Because of its manageable weight and ergonomic grip, it works well for beginners and younger shooters under adult supervision, though the 12-gauge recoil still demands good technique.
Pros & Cons
- Pros: Compact and easy to store; proven Mossberg reliability; includes side saddle for extra ammo; accepts optics via top rail; breacher muzzle adds utility.
- Cons: The bird’s-head grip can feel less stable than a full stock for some shooters, especially when using heavier 3-inch shells. Recoil is stiffer than a stocked shotgun of the same gauge.
Comparison
| Feature | Mossberg 590 Shockwave SPX | Remington 870 Tac-14 | Kel-Tec KS7 |
|---|---|---|---|
| Action | Pump | Pump | Pump |
| Capacity | 6+1 (with side saddle: 12+1) | 4+1 | 6+1 |
| Weight | 5.5 lbs | 6.4 lbs | 5.9 lbs |
| Barrel Length | 14.375 inches | 14 inches | 13.7 inches |
| Grip | Raptor bird’s-head | Knockoff bird’s-head | Pistol grip (bullpup) |
| Price | $589.40 | $499.00 | $549.00 |
FAQ
Is the Mossberg 590 Shockwave SPX legal to own?
Yes, the Mossberg 590 Shockwave SPX is classified as a firearm with a 14.375-inch barrel and an overall length of 26.5 inches, which meets the minimum requirements under the National Firearms Act (NFA) for a non-NFA item. However, state and local laws vary, so check your local regulations before purchasing.
What is the effective range of the Mossberg 590 Shockwave SPX?
The effective range for shot loads is typically 25 to 50 yards, depending on the choke and ammunition. For slugs, you can reach out to 75 yards with practice. It’s best suited for close-quarters use, such as home defense or truck gun.
Can I mount a red dot on the Mossberg 590 Shockwave SPX?
Yes, the SPX model includes a removable top rail that accepts standard Picatinny-compatible optics. Many shooters mount a red dot for faster target acquisition, especially in low-light conditions.
How does the Mossberg 590 Shockwave SPX compare to the standard Shockwave?
The SPX adds a receiver-mounted side saddle (holds 6 extra shells) and a removable top rail, while the standard Shockwave has a bead sight and no accessory mounts. The SPX is better suited for those who want to customize their shotgun with optics or carry spare ammo.
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Internal links: Shotguns | Pump Action Shotguns | Mossberg
Last updated: April 2026
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