ATI Aluminum Fluted Magazine Extensions

ATI has developed a nice looking aluminum fluted magazine extension that will be available for a range of shotguns. Three different end caps are available. There is a regular flat cap, a flat cap with a swivel stud and a spiked stand-off cap. The stand-off cap would be useful for law enforcement officers with short barreled shotguns where the magazine extension will extend further than the barrel.

Fluted Mag Extensions


The press release …

Advanced Technology International® (ATI), the leading manufacturer in gun stocks and firearm accessories is now shipping aluminum fluted magazine extensions for select Remington, Winchester, and CZ 12 gauge shotguns.

ATI’s new magazine extensions will be offered with three different end caps for the customer to choose from. The three style options include a standard flat cap, swivel stud cap, and stand-off cap, with each providing a different style or unique combat option.

”The fluted magazine extensions will be offered in both 7 and 8-shot models which add 2 and 3 shells respectively,” said Jon Shaffer, Director of Business Development.

Shaffer later added that the extensions were uniquely engineered to match the outside diameter of the shotgun’s barrel lug. Designing the extensions in this way was key for ATI to make their aftermarket accessory flow seamlessly with the firearm.

The magazine extensions are constructed of Military Type III anodized 6061 T6 aluminum, and are covered by a limited lifetime warranty like all of ATI’s U.S. made products.

For additional information on this product, or to place an order, please contact ATI online at or by phone at 1-800-925-2522 for international ordering.

Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


  • DougE

    I’m surprised they produced something for Winchester over Mossberg.

    • Ian

      Well it is the superior gun.

    • Rick Randall

      Can’t do a standard extension tube on a Mossberg 500 — only on the 590s. Don’t really NEED to do it for the 590s.

  • JT

    Standoff Cap: “here, please grab my gun away from me” I can see the use on the barrel for breachers, but the only thing this is gonna do is make your shotgun look like Biff Tannon’s hoverboard from back to the future

    • fakefrank0002

      If you are looking for function for the end cap, isn’t intimidation the last line of defense before you send an ounce of lead in someones direction?

  • Mystick

    I still want to see an endcap that has a built-in(in-line coaxial, not offset parallel) adapter for a Surefire or something. I thought I saw one at a gun show at one point, but I haven’t been able to find it recently. I think it was a custom fitting.

    • Ryan

      That would be nice. Sure beat’s the clunkiness of hanging it beneath or to the side of the tube.

    • RickH

      With new lighting technology, I’ve thought the same thing for years. With manufacturers making just about everything, I’m surprised this hasn’t come out.

      • Mystick

        I know I’ve seen one at a gun show…. about 5 years ago. I think it was on a tacticool Mossberg semi of some flavor, if I’m not mistaken. I’m not sure if was an aftermarket product or something somebody did on their own. There wasn’t a whole lot to it… just a “block”-style tube cap with a flashlight in it. No rails or anything. It was flared some to accommodate the light, and there was an on-off micro-slider switch on the left side kind of in a recess to protect it. I think they hat to modify the flashlight to get it to work…. it was an aluminum bodied light that was threaded on the outside to go into the block.

        It went very well with the gun. It end of it was about half an inch behind the muzzle. I almost bought it, but I was looking for something specific that day.