Last updated and checked October 28, 2026 · By Nick Hall, shotgun shooter who has run both the Mossberg 590 and 590A1 through 500+ round tests
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- Treat every gun as loaded
- Point the muzzle in a safe direction
- Keep your finger off the trigger until you’re ready to shoot
- Know your target and what’s beyond
I’ve shot both of these shotguns extensively over the years, running everything from birdshot to full-power slugs and buckshot through them. The 590A1 has been my dedicated home defense gun for a long time, but I’ll be the first to admit it’s not the right choice for everyone. The standard 590 is a seriously capable shotgun in its own right.
Quick Answer: The Mossberg 590A1 is the 590 built to MIL-SPEC 3443G, with a metal trigger guard and safety, a Parkerized finish and, on 9-shot models, a bayonet lug. It is not the heavier gun. Mossberg lists the synthetic-stock 590A1 9-shot at 7 lb, while the 590 9-shot M-LOK weighs 7.25 lb and the heat-shield 590 weighs 7.75 lb.
At list price the A1 costs $147 to $448 more, depending on the model. On our pricing cards today the matched M-LOK pair is only $76 apart: $553.99 for the 590 and $629.99 for the 590A1. At that gap, I’d buy the A1.
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The Mossberg 590 and 590A1 look like the same shotgun on the rack, and for most of their parts they are. Same action, same dual extractors, same top-mounted ambidextrous safety, same twin action bars and anti-jam elevator. The question is what the extra money on the A1 actually buys you.
Most comparisons answer that from memory, and they get it wrong. The usual line is that the A1 has the heavy barrel and the 590 doesn’t, and that the A1 is the heavier gun. So I pulled every 590 and 590A1 spec sheet on Mossberg’s site, matched the models config for config, and checked the prices our cards show readers today. Two of the things everybody repeats turned out to be false.
How we tested: Every pick here is ranked against our testing methodology. Minimum round counts, accuracy and reliability protocols, the failures that disqualify a gun.
Mossberg 590 vs 590A1 Specs Comparison
For a fair head-to-head I’m comparing the closest matched pair Mossberg sells: the 590 M-LOK, SKU 50674, against the 590A1 M-LOK, SKU 50768. Both are 12 gauge, 20 inches, 8+1, with an M-LOK forend and ghost ring sights. For the box-magazine version, see our Mossberg 590M review.
| Spec | Mossberg 590 M-LOK, 50674 | Mossberg 590A1 M-LOK, 50768 |
|---|---|---|
| Gauge | 12 gauge, 3 in chamber | 12 gauge, 3 in chamber |
| Barrel | 20 in, heavy-walled | 20 in, heavy-walled |
| Finish | Matte blue | Parkerized |
| Choke | Accu-Choke, cylinder bore installed | Fixed cylinder bore |
| Capacity | 8+1 | 8+1 |
| Overall length | 41 in | 41 in |
| Length of pull | 12 to 13 in, adjustable | 13.87 in, fixed |
| Sights | Ghost ring | XS ghost ring on a rail |
| Stock | Synthetic, M-LOK forend | Synthetic with 4-shell storage, M-LOK forend |
| Trigger guard and safety | Standard | Metal |
| Military spec | None listed | MIL-SPEC 3443G |
| Weight | 7.25 lb | 7 lb |
| MSRP | $714 | $861 |
| Street price, Oct 28 | $553.99 | $629.99 |
Read the barrel row twice. On this pair, Mossberg lists both barrels as heavy-walled. The things that really separate them are the finish, the metal trigger guard and safety, the military spec, and a handful of choices around the stock and choke that cut both ways.
The Heavy Barrel Myth
Every A1 has a heavy-walled barrel. Mossberg says so on every 590A1 page, and it is a real feature: a thicker barrel takes a knock against a door frame or a truck bed and doesn’t dent.
But the heavy barrel is not exclusive to the A1 anymore. Mossberg’s spec sheet for the 590 M-LOK, 50674, lists its barrel type as heavy-walled too. The 9-shot 590s with a heat shield, like 50693, list the barrel as heat shield instead. So if the barrel is the only reason you’re looking at the A1, check the exact SKU first. You may already be holding one.
I’ve seen standard 590 barrels survive years of hard use without any issues. But I’ve also watched shooters bang their barrels on barricades and doorframes during force-on-force training. That’s where the A1 barrel earns its keep. If you’re a “train hard” kind of shooter, the heavy barrel is a real functional upgrade, not just a marketing gimmick.
Weight: The A1 Is Not the Heavier Gun
This is the other thing that gets repeated without anyone checking. Mossberg lists the synthetic-stock 590A1 9-shots, bead or ghost ring, at 7 lb. The 590 M-LOK is 7.25 lb, and the heat-shield 590 9-shot is 7.75 lb. The heat shield and the adjustable stock add more than the A1’s metal parts do.
It flips on the short guns. The 590 7-shot, 50778, is 6.3 lb against 7 lb for the 590A1 7-shot, 50766, so on an 18.5 inch barrel the A1 really is the heavier shotgun by about 11 ounces. Either way, the difference is small enough that I wouldn’t pick between these two on weight.
Trigger Guard and Safety: Where the A1 Really Differs
The metal trigger guard and safety are on Mossberg’s feature list for every 590A1, and they are the upgrade that matters most on a gun that gets dropped, banged into a vehicle or carried in the cold. A standard 590 runs fine on its factory parts, and I have never cracked one.
But this is a duty-gun upgrade. If the shotgun lives in a safe and comes out for a class twice a year, you won’t feel it. And if you want a different control layout entirely, the Mossberg 590R swaps the tang safety for an AR-style rotary selector.
In my experience, the ghost ring sights on the 590A1 are fast to acquire and intuitive to use. Your eye naturally centers the front post in the rear ring. For home defense at across-the-room distances, either sight works. But if you ever want to stretch the legs of your shotgun with slugs or need to make a precise shot past 25 yards, the ghost rings are vastly superior.
If the bayonet lug is your primary reason for picking the 590A1 over the standard 590, I’d encourage you to rethink your priorities. But as one piece of a larger package of mil-spec upgrades, it’s a nice bonus.
Both of these shotguns are extremely reliable. The Mossberg 500/590 platform has been around since 1960, and the design has been refined over six decades. The dual extractors, anti-jam elevator, and top-tang safety are all proven features shared by both models. I’ve never had a malfunction with either gun that wasn’t caused by limp-wristing the pump stroke.
MIL-SPEC 3443G: What the Label Means
Mossberg calls the 590A1 “the most durable of our pump action shotguns, meeting MIL-SPEC 3443G.” That’s the claim, word for word. You’ll see 3443E in older write-ups, but Mossberg’s own page says G.
What you’re buying with that label is a build spec, the heavy-walled barrel, the metal trigger guard and safety, the cleanout magazine tube and the Parkerized finish, all called out together. Mossberg doesn’t publish a round count for it on the product page, so I won’t put a number on it here. The Parkerized finish is the piece you will notice first. It holds up to sweat, rain and a damp truck far better than matte blue.
Sights, Chokes and Stocks: The Trade-Offs
Ghost rings are not an A1 exclusive either. Mossberg says “a majority of 590A1 models” wear them, but the 590 9-shot 50693 and the 590 M-LOK both ship with ghost rings, and there’s a bead-sight 590A1, 51660, at $861. Pick the sight, then the badge.
Two details favor the plain 590 M-LOK. Its muzzle takes Accu-Choke tubes, while the A1 M-LOK and the standard A1 9-shots are fixed cylinder bore, which matters if you want a tighter buckshot pattern. And its stock adjusts from 12 to 13 inches of pull, which helps a smaller shooter or anyone running the gun in a plate carrier.
The A1 answers with the bayonet lug on 9-shot models and, on 50768, a stock that holds four spare shells. Will you ever fix a bayonet to a home defense shotgun? No. It’s still part of the military pattern, and it’s one of the quickest ways to tell an A1 from a 590 across the gun counter.
Mossberg 590 vs 590A1 Price: List vs Street
I matched five configurations Mossberg sells in both versions. At list price the A1 premium runs from $147 on the M-LOK pair to $448 on the walnut Retrograde, with the plain 9-shot ghost ring pair at $263.
Street prices tell a different story. On October 28, 2026, the lowest trusted-retailer price on our cards was $553.99 for the 590 M-LOK at Palmetto State Armory and $629.99 for the 590A1 M-LOK 20 inch at Sportsman’s Warehouse. That’s a $76 gap for metal controls, a Parkerized finish and the military spec, which is a far easier call than the $147 list gap suggests.
Prices move every day, so check the live cards above before you buy. If the gap on the day you shop is closer to the list difference, the math changes.
Reliability: Same Action, Same Record
Both guns run the same pump action, and in my experience it is about as forgiving as pumps get. I’ve had stoppages on both, and every one traced back to me short-stroking the forend under time pressure, not to the gun. Run it hard and finish the stroke.
So the A1’s case is durability and corrosion, not cycling. For a gun that sits in a climate-controlled bedroom, that is a smaller advantage than the marketing implies. For a patrol car, a boat or a ranch truck, it’s the whole reason to buy one.
The Verdict: Which Mossberg Should You Buy?
Personally, I’d steer most people toward the 590A1. The ghost ring sights alone make it a more capable shotgun, and the durability upgrades give you a gun you’ll never outgrow. But I would never tell someone they made a bad choice by picking the standard 590. It’s a legendary shotgun for good reason. For a deeper look at the A1 variant, check out our full Mossberg 590A1 review.
Buy the Mossberg 590 if: you want choke tubes, an adjustable stock, or the lowest price on a proven 8+1 pump. The 590 M-LOK gives you the heavy-walled barrel and ghost rings for $147 less at list, and it’s the better fit for a shorter shooter.
Buy the Mossberg 590A1 if: the gun will live in a vehicle, get carried in bad weather or get issued, or you just want the version built to a military spec. Metal controls and a Parkerized finish are what you’re paying for, and at a $76 street gap they’re cheap.
For most people reading this, I’d buy the A1 at today’s prices and the 590 if the gap goes back over $150. If you want more rounds in the tube, the Mossberg 590S takes minishells, and if you’re open to looking past the 590 family entirely, our best Mossberg shotguns roundup ranks the rest of the line. For the full test of the A1 on its own, read our Mossberg 590A1 review.
Want something stranger than either? The Mossberg 590 Shockwave uses the same action with a 14-inch barrel and a bird’s-head grip, and it isn’t legally a shotgun at all.
Facts and Figures
- The 590A1 meets MIL-SPEC 3443G, according to Mossberg’s 590A1 page.
- Mossberg lists the synthetic-stock 590A1 9-shot at 7 lb and the 590 M-LOK 9-shot at 7.25 lb, per the 590 M-LOK spec sheet.
- Both the 590 M-LOK, 50674, and the 590A1 M-LOK, 50768, list a heavy-walled 20 inch barrel and an 8+1 capacity.
- The A1 list-price premium runs from $147 to $448 across five matched models.
- On October 28, 2026 the matched M-LOK pair was $76 apart at trusted retailers: $553.99 against $629.99.
Related Guides
- Best Pump-Action Shotguns
- Mossberg 590A1 Review
- Mossberg 500 Review
- Remington 870 Shotgun Review
- Best Shotguns for Home Defense
Frequently Asked Questions
What is the difference between the Mossberg 590 and 590A1?
The 590A1 is built to MIL-SPEC 3443G, with a metal trigger guard and safety, a Parkerized finish, a heavy-walled barrel and a bayonet lug on 9-shot models. The action, capacity and barrel lengths are the same. Some standard 590s, like the 590 M-LOK 50674, also list a heavy-walled barrel, so the metal controls, the finish and the military spec are what really separate them.
Is the Mossberg 590A1 heavier than the 590?
Not in the 9-shot models. Mossberg lists the synthetic-stock 590A1 9-shots, 51660, 51663 and 50768, at 7 lb, against 7.25 lb for the 590 M-LOK and 7.75 lb for the heat-shield 590 9-shot. On the 18.5 inch 7-shot guns it flips: the 590A1 50766 is 7 lb and the 590 50778 is 6.3 lb.
Is the Mossberg 590A1 worth the extra money?
At today's street prices, yes for most buyers. The matched M-LOK pair was $76 apart on October 28, 2026, $553.99 for the 590 and $629.99 for the 590A1, which is a small price for metal controls and a Parkerized finish. At list price the gap runs from $147 to $448, and if the street gap climbs past $150 the standard 590 is the better value.
What does MIL-SPEC 3443G mean on the 590A1?
It is the military specification Mossberg says the 590A1 meets. Mossberg ties it to the heavy-walled barrel, metal trigger guard and safety, cleanout magazine tube and Parkerized finish. Older articles cite 3443E, but Mossberg's own 590A1 page says 3443G.
Do all Mossberg 590A1 shotguns have ghost ring sights?
No. Mossberg says a majority of 590A1 models wear adjustable ghost rings, but the 590A1 9-shot 51660 and the 7-shot 50766 ship with a bead. Ghost rings aren't A1-only either: the 590 9-shot 50693 and the 590 M-LOK have them.
Can you use choke tubes in a Mossberg 590A1?
Not the standard models. The 590A1 9-shots 51660, 51663 and the M-LOK 50768 are fixed cylinder bore on Mossberg's spec sheets. The 590 M-LOK 50674 has an Accu-Choke muzzle with a cylinder bore tube installed, so it takes Mossberg's Accu-Choke tubes if you want a tighter pattern.
Which is better for home defense, the Mossberg 590 or 590A1?
Either one runs the same action and holds 8+1 in the 20 inch models. The 590 M-LOK gives you an adjustable stock and choke tubes for less money, while the 590A1 gives you metal controls and a finish that handles moisture better. For a gun that stays in the house, buy whichever is cheaper on the day; for a vehicle or a duty gun, buy the A1.
Does the Mossberg 590A1 have a bayonet lug?
The 590A1 9-shot models do. Mossberg says 9-shot models come with a bayonet mounting lug, and you can see it under the muzzle on the 590A1 M-LOK, 50768. It is a nod to the military pattern more than a home defense feature.
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