Mossberg 590S Shockwave 18.5" 12 Gauge Shotgun - Black (Model 51600)
$556.59
$700.00
(You save
$143.41
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- Capacity-Rounds:
- 10
- Caliber-Gauge:
- 12 Gauge
- Barrel Length:
- 18.5"
- Barrel Length Range:
- 18" to 18.99"
- OAL:
- 30.75"
- Weight:
- 5.50 lbs
- Action:
- Pump
- Safety:
- Ambidextrous Top Tang
- Metal Finish:
- Fixed Raptor Birdshead Grip
- Sights:
- Bead Front
- Weight Range:
- 5 lbs to 5.99 lbs
- Stock Material:
- Synthetic
- Grips:
- 5.50 lbs
- Stock Finish:
- Black
- Stock Type:
- Bead Front
The Mossberg 590S Shockwave 12 gauge shotgun with 18.5" barrel is a pump-action workhorse built for hunters and sport shooters who demand flexibility without compromise. What sets the 590S apart is its ability to cycle three different shell lengths—1.75", 2.75", and 3"—interchangeably, straight from the box. That means you can load a magazine with a mix of shell lengths to match your shooting situation, whether you're hunting upland birds, running clay targets, or keeping one at the ready for home defense. The Shockwave's short barrel and pistol-grip design keep things compact and maneuverable in tight spaces.
Mossberg engineered the 590S with three key upgrades to achieve that shell-cycling flexibility: a redesigned elevator and bolt slide, plus an energy-absorbing bumper that lets the gun handle different shell pressures and lengths without missing a beat. The pump mechanism itself is a Mossberg proven design—dual extractors, twin action bars, and positive steel-to-steel lockup keep everything running smooth and reliable. You get a top-mounted ambidextrous safety, so whether you're right or left-handed, manipulating the gun is natural. The M-LOK compatible forend lets you attach lights, slings, or other accessories if you want to customize your setup.
With an 18.5" barrel, you'll get nine rounds of 1.75" shells (9+1), six rounds of 2.75" shells (6+1), or five rounds of 3" shells (5+1) ready in the magazine. The bead sight keeps you on target, while the matte finish on the receiver and barrel handles hard use without unnecessary shine. This is a no-nonsense shotgun for serious shooters—reliable, adaptable, and built to last.
Key Features
- Cycles 1.75", 2.75", and 3" shells interchangeably in any combination
- 18.5" barrel with bead sight for fast target acquisition
- Mossberg 590 proven reliability: dual extractors, twin action bars, and steel-to-steel lockup
- Shockwave pistol grip for compact, maneuverable handling
- M-LOK compatible forend for mounting tactical accessories
- Top-mounted ambidextrous safety
- Positive anti-jam elevator and energy-absorbing bumper for smooth cycling
- Matte blue metal finish for durability
Specifications
| Gauge | 12 |
| Barrel Length | 18.5" |
| Action Type | Pump-Action (Slide-Action) |
| Capacity (1.75" shells) | 9+1 |
| Capacity (2.75" shells) | 6+1 |
| Capacity (3" shells) | 5+1 |
| Sight | Bead |
| Grip | Shockwave Pistol Grip |
| Finish | Matte Blue |
| Model Number | 51600 |
Frequently Asked Questions
Can the 590S Shockwave handle different shell lengths without adjustment?
Yes. The 590S is designed to cycle 1.75", 2.75", and 3" shells interchangeably, and you can even load them in any combination in the same magazine. No tools or adjustments needed—Mossberg's redesigned elevator, bolt slide, and energy-absorbing bumper handle the pressure and length differences.
How many shells does the 18.5" barrel hold?
Capacity depends on shell length. The magazine will hold 9+1 rounds of 1.75" shells, 6+1 rounds of 2.75" shells, or 5+1 rounds of 3" shells.
Is the 590S Shockwave good for home defense or hunting?
The short 18.5" barrel and pistol grip make it maneuverable in tight indoor spaces, so it's well-suited to home defense. The ability to mix shell lengths also makes it flexible for different hunting scenarios. It's a versatile shotgun, though your choice depends on your specific needs and local regulations.
Can I add a light or sling to the 590S Shockwave?
Yes. The forend is M-LOK compatible, so you can mount lights, slings, or other M-LOK accessories to customize the shotgun for your setup.
Firearm Shipments:
To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.
We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.
We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.
Email: [email protected]
- Prior to placing an order, it is the buyer's responsibility to understand and adhere to their state's firearm regulations.
- The buyer should verify with their receiving dealer that the chosen firearm is legally permissible in their state.
- The buyer is accountable for any transfer fees or background check charges imposed by the receiving dealer. If the designated dealer declines to accept the firearm delivery, the buyer assumes responsibility for shipping costs to retrieve the firearm and resend it to an accommodating dealer.
- Handguns will be shipped using air transportation, while long guns can be shipped using ground methods. If your order includes a mix of firearm and non-firearm items, BOSQUE Outdoors will send the firearm(s) to your selected FFL dealer and the remaining non-firearm items to your billing address.
- Firearms cannot be returned to BOSQUE Outdoors; please contact the manufacturer for warranty claims.
- Firearms refused by the FFL Dealer or which cannot be transferred due to a failed background check are subject to a $75 restocking fee plus 10% of the purchase price.
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