Mossberg 590 Shockwave (12 ga)
A compact 14-inch pump sold as a non-NFA 'firearm,' not a shotgun. Handy and short — and harder to shoot well than it looks.
Mossberg states the 590 Shockwave is classified as a 'firearm' under the Gun Control Act of 1968 and, at its 26-inch-plus overall length, is not subject to the NFA, while warning that some state and local laws may treat it as a short-barreled shotgun or assault weapon. A 2017 Texas legislator's opinion request cites an ATF determination that it is a GCA 'firearm' because it was not designed to be fired from the shoulder, shipped without a stock, and exceeds 26 inches overall.[3][4][5]
Some states treat these differently — check yours in the state-law checker. Adding a shoulder stock or a vertical foregrip can change the federal classification; see the SBS & NFA guide.
Who it's for
- Mid-priced: about $592 list price from the maker.
- No shoulder stock: it's built to be fired without shouldering, which takes real practice to do accurately.
- Light at 5.25 lb — easy to handle, but lighter shotguns send more recoil back to you.
Specs
Straight from the maker's product page[1]. "Not listed by maker" means the maker doesn't publish that number.
| Maker | Mossberg |
| Model used for specs | 50659 (590 Shockwave, 12 ga, 14.375") |
| Action | pump |
| Gauge | 12 |
| Chamber | 3" |
| Barrel length | 14.375" |
| Capacity | 5+1 (tube) |
| Overall length | 26.37" |
| Weight | 5.25 lb |
| Length of pull | N/A (no shoulder stock; not listed) |
| Stock | Raptor bird's-head grip / corn-cob forend with strap |
| Sights | Bead |
| Choke | Cylinder bore |
| Receiver | Not listed by maker |
| Finish | Matte blue (heavy-walled barrel, as listed) |
| Maker list price | $592 |
Mossberg files the Shockwave under 'Others', not 'Shotguns'. Federal purchase age is 21 per the Mossberg press release. No ATF-hosted letter was located; the ATF determination is cited secondhand. Weight listed as '5.25' with no unit.
Features (from the maker)
- Raptor bird's-head grip instead of a shoulder stock
- Strapped corn-cob forend
- Heavy-walled 14.375" barrel
- Clean-out tube; drilled and tapped receiver
- Steel-to-steel lockup, twin action bars, anti-jam elevator, ambidextrous safety, dual extractors
- Mossberg series page: the 14" models do not require Federal Class III paperwork for transfers
Set it up
Gear that fits most home-defense setups. Check fitment for the exact Mossberg 590 Shockwave model you buy.
Weapon-light mount
You can't identify a target you can't see.
AMMOSide-saddle shell carrier
Extra shells on the receiver.
CARRYTwo-point sling
Hands free when you need them.
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Compare with
Remington 870 TAC-14 (12 ga)
Remington's 14-inch non-NFA 'firearm' with a bird's-head grip — compact, but it takes practice to shoot accurately.
FROM $290 LISTMaverick 88 Security
Mossberg's budget Maverick line in a home-defense trim — the lowest list price of any shotgun on this list.
FROM $390 LISTWinchester SXP Defender
Winchester's pump in a Defender trim with an 18-inch barrel — an affordable alternative to the Mossberg and Remington pumps.
Sources
Last checked October 18, 2026. Spotted something out of date? Send a correction.