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Posted: 1/15/2026 9:59:57 PM EDT
[Last Edit: GBTX01][Edited]
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https://www.guns.com/news/2026/01/13/mossberg-990-spx-magpul-shotgun Mossberg announced inconjuction with Shotshow that they are coming out with 14.75" 990 and it is OPTIC READY!   Mossberg is expanding its tactical 990 line of 12-gauge semi-auto shotguns with two new options: the 990 SPX Magpul and 990 SPX Magpul – Class 3. The latter is an NFA-covered short-barreled shotgun, which you can expect to see more of now that the $200 tax on short-barreled NFA items has expired. These new scatterguns sport either an 18.5-inch barrel or a 14.75-inch barrel. They are decked out in Magpul SGA Adjustable LOP stocks with spacers for a customizable length of pull between 12 and 14 inches. QD ports and M-LOK slots make them sling- and accessory-ready, and they both run the company’s smooth-running 990 gas-vent system. Unlike the similar-looking 940 Pro Tactical, the 990 series doesn’t require a long, straight return spring in the buttstock. Instead, that feature runs entirely in the forend, which allows for a more tactical, pistol-like grip angle and more diverse stock options. The 990 SPX Tactical with the 18.5-inch barrel comes in at 7.75 pounds and offers a 7+1 capacity. The shorty Class 3 version is a lighter 7.35 pounds with a 5+1 capacity. Both feature 3-inch chambers and are threaded for the Accu-Choke system. They ship with a cylinder-bore choke installed. Both models run ghost-ring rear sights that can be swapped for a micro red dot. The guns ship with three additional adapter plates for mounting RMR, Docter, and Leupold footprint optics. A heat shield runs up to the top of the forend. The gas piston, magazine tube, hammer, and sear are covered in a nickel-boron coating with special finishes for corrosion resistance. The bolt handle, elevator, bolt release, and beveled loading port are oversized for ease of use. The top-mounted tang safety also makes this an ambidextrous platform. Both models have an MSRP of $1,309. |
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I have been strongly considering converting a 990 into an SBS. The challenges or additional work I wanted done... - Mill for an optic - Thread for Chokes - Add Magpul stock This new factory offering literally checked all the boxes for me. It looks turn key and ready to take advantage of the $0 stamp market! Now the waiting game to see how long it takes to get to market. |
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I was at Shot last week the 990 SBS is wicked. I have one on order from a distributor. It’s perfectly balanced. And feels really handy. The only thing that I’m struggling with is losing 2 rounds for 5”+/- shorter profile. For home defense I’m still going with the 7rd 1301, but it’s very intriguing if you need to get to a different location in your home, to protect other family members, or are part of a entry team with plenty of backup. |
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Originally Posted By CQB762: I was at Shot last week the 990 SBS is wicked. I have one on order from a distributor. It’s perfectly balanced. And feels really handy. The only thing that I’m struggling with is losing 2 rounds for 5”+/- shorter profile. For home defense I’m still going with the 7rd 1301, but it’s very intriguing if you need to get to a different location in your home, to protect other family members, or are part of a entry team with plenty of backup. I wonder if you can ghost load the 990? |
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This gun is a 990. Is it related to the 940? Anyone know? I ask because the 940 has some real issues, mainly cycling. The NFA version (SPX) at 14.75 inches and 7.35 pounds. Mossberg says accu-choke system, comes with CB installed. Mossberg quality and reliability??? Good reputation in the past. The action spring, piston, op rods, and slide on the mag tube limit shortening it any more. If your not going any shorter, this configuration is fine and reliable in most cases. Winged FO front sight. Quick target aqusition over the standard bead sight. MSRP of $1309, a bit steep, street price should be better. Nice addition from Mossberg in the SBS field. Here is an exploded view of the 990 Aftershock. Should be same confuguration.  |
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Just came across this thread in my research for a SBS project. This checks all the boxes for me for sure. Looked around and saw that Lipseys has them listed on their site. Will probably get my local dealer to get a price and availability from them next time I'm in there. |
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Originally Posted By NamLeets: Just came across this thread in my research for a SBS project. This checks all the boxes for me for sure. Looked around and saw that Lipseys has them listed on their site. Will probably get my local dealer to get a price and availability from them next time I'm in there. Damn you all! I just placed an order for the 990 SPX but as soon as I get it, Form 1 it goes. Does the 990 take the standard Magpul stock for Mossbergs? ROCK6 |
"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants" - Thomas Jefferson
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My Aftershock SPX should be shipping soon. The SPX version supposedly is set up for SBR and it's also milled for an optic. I'm still assuming the 990 is compatible with the Magpul SGA/590 stock as I have one laying around somewhere once I get my Form 1 filed and back. I don't have a convenient NFA dealer, so doing my own Form 1 will take longer but is logistically easier...besides, I haven't seen the SBS version available yet anywhere. Originally Posted By 03RN: I wonder if you can ghost load the 990? Since it's very similar to the 940, I'm assuming you can ghost load it. Give a couple of weeks and I'll let you know  ROCK6 |
"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants" - Thomas Jefferson
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Originally Posted By ROCK6: My Aftershock SPX should be shipping soon. The SPX version supposedly is set up for SBR and it's also milled for an optic. I'm still assuming the 990 is compatible with the Magpul SGA/590 stock as I have one laying around somewhere once I get my Form 1 filed and back. I don't have a convenient NFA dealer, so doing my own Form 1 will take longer but is logistically easier...besides, I haven't seen the SBS version available yet anywhere. Since it's very similar to the 940, I'm assuming you can ghost load it. Give a couple of weeks and I'll let you know ROCK6 Yep, looks like the same Mossberg 500/590 stocks will fit:  What Stocks Fit The 990 Aftershock??? |
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Well, Aftershock 990 SPX "Firearm" received earlier this week on Monday and filed Form 1 as soon as I got it home. Now, I know I have a Magpul stock around somewhere...just can't find it ROCK6 |
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| Has anyone gotten their hands on a factory SBR yet? I’ve seen multiple reports that the standard 990, when SBR, can have some reliability issues, and the initial reviews on the factory SBR say it’s been tuned to be an SBR. Has anybody seen any reporting on what was changed? Different springs? Different ports? |
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Originally Posted By Shackelford762: Has anyone gotten their hands on a factory SBR yet? I’ve seen multiple reports that the standard 990, when SBR, can have some reliability issues, and the initial reviews on the factory SBR say it’s been tuned to be an SBR. Has anybody seen any reporting on what was changed? Different springs? Different ports? The original 990 wasn't tuned for being an SBR, the SPX model is supposedly designed to work as an SBR. I think the initial Aftershock 990 can work, but just needs some work. ROCK6 |
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Originally Posted By ROCK6: The original 990 wasn't tuned for being an SBR, the SPX model is supposedly designed to work as an SBR. I think the initial Aftershock 990 can work, but just needs some work. ROCK6 Right, that’s my question, what changes were made? Gas port size? springs? Can it be readily converted from one config to the other? Even with zero dollar tax stamps, it can be a pain to buy a factory SBS, versus a standard 990 and converting. Any chance they’ll offer an SBR conversion kit of some kind? |
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Originally Posted By Shackelford762: Right, that’s my question, what changes were made? Gas port size? springs? Can it be readily converted from one config to the other? Even with zero dollar tax stamps, it can be a pain to buy a factory SBS, versus a standard 990 and converting. Any chance they’ll offer an SBR conversion kit of some kind? What's the pain in buying the SBS? No dealer? |
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Originally Posted By Shackelford762: Right, that’s my question, what changes were made? Gas port size? springs? Can it be readily converted from one config to the other? Even with zero dollar tax stamps, it can be a pain to buy a factory SBS, versus a standard 990 and converting. Any chance they’ll offer an SBR conversion kit of some kind? From what I read, and part of why the Magpul version is a SBR: "For 2026, the NFA tax fee for items like suppressors and SBSs dropped to $0, causing a massive spike in demand. Mossberg saw this as the perfect moment to release the 990 SPX Magpul, which is a dedicated, factory-tuned platform built specifically to run with a stock. Engineers retuned the gas system so the extractor and internal bars handle the increased cyclic rate smoothly. Because all the recoil components live up front in the 990 series, the rear of the receiver stays completely free. This allows for essentially any stock configuration you want" ROCK6 |
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Originally Posted By ROCK6: “Engineers retuned the gas system so the extractor and internal bars handle the increased cyclic rate smoothly." I don’t mean this to dog you, Rock6, instead it’s aimed at Mossberg… I’m sorry, that is meaningless marketing speak. I ask again, which parts were changed and how? Will it be possible to retrofit a gun bought as a “firearm” into this configuration? Will Mossberg or some third party be able to bring a “SBS conversion kit” to market? |
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Originally Posted By ALASKANFIRE: What's the pain in buying the SBS? No dealer? For one, has Mossberg even shipped this yet? Secondly, four shops around me have standard 990s in stock, some at very competitive prices. Meanwhile, if I want a SBS, best case I have to special order it, a longer wait on top of the NFA hoopla, plus I’m almost guaranteed to pay MSRP. |
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"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants" - Thomas Jefferson
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Originally Posted By ROCK6: Well, stamp received last week for my Aftershock and it took all of 5 minutes to add the Magpul SGA stock. I just fired off a tube of birdshot to functions check and it worked flawlessly. I'm kind of hoping something comes out for an optic rail and integrated rear BUIS, but for now, it's just the optic and I will add a Velcro card attachment as a sidesaddle. https://hosting.photobucket.com/3a5ba44e-72a5-4ded-b00a-39a4440c67c0/821a28ab-13f1-42c0-8cd9-5dcb53860da8.jpg?width=960&height=720&fit=bounds" target="_blank">https://hosting.photobucket.com/3a5ba44e-72a5-4ded-b00a-39a4440c67c0/821a28ab-13f1-42c0-8cd9-5dcb53860da8.jpg?width=960&height=720&fit=bounds ROCK6 That aftershock looks good set up that way. Some folks don't like the forend, call it ugly and other things. I like how it sets with the SGA stock. Excellent combo. I like. |
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Originally Posted By Namsag: That aftershock looks good set up that way. Some folks don't like the forend, call it ugly and other things. I like how it sets with the SGA stock. Excellent combo. I like. Beauty is in the eye of the beholder and all  With as fast as it will cycle, the extra (uglish) side coverage makes sense as I can see this heating up pretty quickly. I assume there will be more accessories for it in the near future.ROCK6 |
"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants" - Thomas Jefferson
Any updates on the factory SBS (83014 ) vs. Form 1ing an Aftershock SPX (83010 )?   I chose these two models because I wanted to see if I could find out why the Form1d ASs were struggling, and these two are the most closely related between the Class 3 vs/ AOW versions. Another reason I chose these two was to see what I could find in writing to rebut the comments made from Jeremy at Mossberg, from the ShotShow videos (1 ), about 'extractor and gas system tuning', but I'm flagging that as marketing speak. I highly doubt that Mossberg would spend the time to materially differentiate the two models; they decided to take the stock off the SBS, and sell it with the bird head grip, add an optic plate cover. There's the AS SPX (83010) I've been doing some deep diving into the manuals and there don't seem to be any part number differences between these two models, outside of the stock obviously, and the cover plate. Of note the manual does stipulate a break-in period: "Recommended live fire break-in period for the model 990 is 50 rounds of commercially manufactured 2-3/4", 12 ga. ammunition, with a payload of 1-1/8 oz., and a velocity of 1200 feet per second or higher... A break-in period is not required for shooting 2-3/4" buckshot or slug loads." Now, why were some Aftershocks failing to cycle the lighter loads? Hard to say. Not a lot of info out there outside of the videos already posted. From what I can see, those struggling with lighter loads were the non-SPX AS versions (not sure when the AS SPX version became available), and the only possible difference I could see would be the barrels, and thus, the gas system. Again would MS really make a different bolt/extractor and barrel/gas port/piston arrangement for a sub 1k OAW set up? I doubt it. Now, others have posted that after break in, all is good to go with a Form1d AS. I'm Form1ing a SPX AS soon. Will report back after break in. If there are any more experiences, chime in. |
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Originally Posted By Eames: Any updates on the factory SBS (83014 ) vs. Form 1ing an Aftershock SPX (83010 )? https://www.mossberg.com/media/catalog/product/cache/e481e64536a684f69707b47f11cbf51f/8/3/83014_990_spx_magpul_black_14.75in_2700x650_1_.jpg https://www.mossberg.com/media/catalog/product/cache/e481e64536a684f69707b47f11cbf51f/8/3/83010_990_aftershock_spx_14.375_2700x650_1_.jpg I chose these two models because I wanted to see if I could find out why the Form1d ASs were struggling, and these two are the most closely related between the Class 3 vs/ AOW versions. Another reason I chose these two was to see what I could find in writing to rebut the comments made from Jeremy at Mossberg, from the ShotShow videos (1 ), about 'extractor and gas system tuning', but I'm flagging that as marketing speak. I highly doubt that Mossberg would spend the time to materially differentiate the two models; they decided to take the stock off the SBS, and sell it with the bird head grip, add an optic plate cover. There's the AS SPX (83010) I've been doing some deep diving into the manuals and there don't seem to be any part number differences between these two models, outside of the stock obviously, and the cover plate. Of note the manual does stipulate a break-in period: Manual 104254 (990 AfterShock) and manual 107251 (990 Autoloading Shotgun), both "Firing" sections. Now, why were some Aftershocks failing to cycle the lighter loads? Hard to say. Not a lot of info out there outside of the videos already posted. From what I can see, those struggling with lighter loads were the non-SPX AS versions (not sure when the AS SPX version became available), and the only possible difference I could see would be the barrels, and thus, the gas system. Again would MS really make a different bolt/extractor and barrel/gas port/piston arrangement for a sub 1k OAW set up? I doubt it. Now, others have posted that after break in, all is good to go with a Form1d AS. I'm Form1ing a SPX AS soon. Will report back after break in. If there are any more experiences, chime in. Originally Posted By Eames: Any updates on the factory SBS (83014 ) vs. Form 1ing an Aftershock SPX (83010 )? https://www.mossberg.com/media/catalog/product/cache/e481e64536a684f69707b47f11cbf51f/8/3/83014_990_spx_magpul_black_14.75in_2700x650_1_.jpg https://www.mossberg.com/media/catalog/product/cache/e481e64536a684f69707b47f11cbf51f/8/3/83010_990_aftershock_spx_14.375_2700x650_1_.jpg I chose these two models because I wanted to see if I could find out why the Form1d ASs were struggling, and these two are the most closely related between the Class 3 vs/ AOW versions. Another reason I chose these two was to see what I could find in writing to rebut the comments made from Jeremy at Mossberg, from the ShotShow videos (1 ), about 'extractor and gas system tuning', but I'm flagging that as marketing speak. I highly doubt that Mossberg would spend the time to materially differentiate the two models; they decided to take the stock off the SBS, and sell it with the bird head grip, add an optic plate cover. There's the AS SPX (83010) I've been doing some deep diving into the manuals and there don't seem to be any part number differences between these two models, outside of the stock obviously, and the cover plate. Of note the manual does stipulate a break-in period: Manual 104254 (990 AfterShock) and manual 107251 (990 Autoloading Shotgun), both "Firing" sections. Now, why were some Aftershocks failing to cycle the lighter loads? Hard to say. Not a lot of info out there outside of the videos already posted. From what I can see, those struggling with lighter loads were the non-SPX AS versions (not sure when the AS SPX version became available), and the only possible difference I could see would be the barrels, and thus, the gas system. Again would MS really make a different bolt/extractor and barrel/gas port/piston arrangement for a sub 1k OAW set up? I doubt it. Now, others have posted that after break in, all is good to go with a Form1d AS. I'm Form1ing a SPX AS soon. Will report back after break in. If there are any more experiences, chime in. I'm actually going to run several dozen shells through my AS 990 SPX SBS this Friday, but I did a quick test fire with some high-brass 2-3/4 #4 shot shells with no issues as the first rounds out the tube. Reading about the break in, that's promising to read Again, I can find people talking about the gas sytems between the original 990 AS and the SPX version but nothing technically verified: Adding a Stock: Mossberg 990 SPX Magpul Plenty of shooters bought the Aftershock and immediately filed Form 1s to add a stock, converting the firearm into an SBS. However, the stockless Aftershock is factory-tuned to run without a shoulder stock. When you shoot a stockless gun, it recoils and moves differently, naturally slowing down the bolt. Pinning the gun to your shoulder changes the physics, making the bolt cycle much faster. On the original Aftershock, this caused the extractor to slip off the shell casing. For 2026, the NFA tax fee for items like suppressors and SBSs dropped to $0, causing a massive spike in demand. Mossberg saw this as the perfect moment to release the 990 SPX Magpul, which is a dedicated, factory-tuned platform built specifically to run with a stock. Engineers retuned the gas system so the extractor and internal bars handle the increased cyclic rate smoothly. Because all the recoil components live up front in the 990 series, the rear of the receiver stays completely free. This allows for essentially any stock configuration you want. The Magpul edition features the SGA stock, which allows shooters to adjust the length of pull using a spacer system, offering better recoil management and a customized fit. ROCK6 |
"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants" - Thomas Jefferson
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