Courtesy CMMG
CMMG 9mm arc magazine
Courtesy CMMG
CMMG’s BANSHEE and RESOLUTE uppers let you quickly convert your standard AR platform lower from .223/5.56 to 9mm Luger. Now they’ve announced the new 9 ARC (AR conversion) magazines designed to feed them. Here’s their press release . . .
Boonville, MO – CMMG Inc. innovates the AR platform yet again with the introduction of the 9 ARC Magazine. Developed in collaboration with Mean Arms™, CMMG’s 9 ARC Magazine (10 or 30-round capacity) makes it possible to shoot 9mm from an AR15 lower receiver when paired with CMMG’s proprietary 9mm Radial Delayed Blowback BANSHEE or RESOLUTE upper.
The 9 ARC Magazine is ideal for those who have a registered SBR or full-auto AR15 lower receiver and want to shoot 9mm. It also offers an affordable way to train or enjoy an outing at the range by allowing users to shoot inexpensive 9mm ammunition while still maintaining the familiar furniture and controls on their existing AR15 lower receiver.
The process of converting an AR15 to 9mm is simple and quick. First, attach a CMMG 9mm Radial Delayed Blowback upper receiver to an existing AR15 lower. Second, insert CMMG’s 9 ARC Magazine to safely feed 9mm ammunition. CMMG recommends using a standard carbine buffer and action spring to reliably cycle the action in this configuration. The 9 ARC Magazine also retains last round bolt hold-open functionality, allowing for faster reloads.
CMMG 9 ARC magazine
Courtesy CMMG
For those who have an abundant amount of Magpul PMAGs™, CMMG will offer 9 ARC Magazine Adapters. The 9 ARC Magazine Adapters are installed into Gen 2/3 PMAG bodies to convert them to 9mm. The 9 ARC Magazine Adapters will be sold as single units, as well as in packs of three, and can be modified to hold 10, 15, 20 or 30 rounds of 9mm ammunition.
One the greatest benefits of using the 9 ARC Magazine is that it allows shooters to enjoy the advantages of CMMG’s patent-pending Radial Delayed Blowback operating system without the need for a proprietary lower receiver. Radial Delayed Blowback has quickly become the gold standard for pistol caliber carbines, primarily due to the reduction in felt recoil versus other direct blowback designs.
CMMG will offer a complete line of firearms in RESOLUTE and BANSHEE configurations that are designed for 9 ARC Magazines. Each is built with CMMG’s Mk4 lower receiver and a dedicated 9mm Radial Delayed Blowback upper receiver.
The MSRP for the 9 ARC Magazine is $44.95 and for the 9 ARC Magazine Adapter is $29.95. The three-pack of 9 ARC Magazine Adapters will retail for $79.95.
CMMG Inc will be exhibiting during the 148th NRA Annual Meeting, showcasing new products like the 9 ARC, .40 S&W BANSHEE and the highly anticipated .350 Legend. Come visit CMMG at booth #5463 to get hands-on experience with the new products and the award-winning Mk47. Also have a chance to meet competitive shooters Team Yackley and a special appearance by legendary UFC fighter Chuck Liddell on Saturday between 1:30pm – 2:30pm.

CMMG Lifetime Quality Guarantee
CMMG, Inc. will guarantee its products against defects in material or workmanship. CMMG, Inc. will repair, replace or substitute part(s) (at CMMG, Inc. discretion) at no charge to the customer if a defect of material or workmanship is found. All service work must be carried out by CMMG, Inc.
About CMMG:
CMMG began in central Missouri in 2002 and quickly developed into a full-time business because of its group of knowledgeable and passionate firearms enthusiasts committed to quality and service. Its reputation was built on attention to detail, cutting edge innovation and the superior craftsmanship that comes from sourcing all their own parts. By offering high quality AR rifles, parts and accessories, CMMG’s commitment to top-quality products and professional service is as deep today as it was when it began.
For more information about CMMG Inc, please visit and follow:

27 COMMENTS

    • I have a set of Mean Arms ENDO9 inserts. They are rockin’ coolness. Absolutely flawless.

      Those with my common pistol lower and dedicated 9mm upper are a hoot to shoot. All but zero recoil. Accurate and fun. Breaks down quick and fits in a small laptop backpack.

      What could be better? Well…if Mean Arms would make a .45 version of their inserts…

  1. Granted, 9mm is about half the price per rd. of 5.56mm but how much would you have to shoot to justify the cost of a new upper and rather expensive mags or converters? The price difference is only 13 cents a rd. So let’s do the math: The Banshee upper goes for about $700 and one mag is $45. So you’d have to burn through nearly 6,000 rds. of 9mm before you started to see a cost saving.

    • Wait, since when do I have to justify things?

      Can’t I purchase something just because it’s fun?!

      Which is why I have to get another gun safe soon…

    • I know people that do this so they can shoot steel at close range. Not just about $$.

      That said I reload 9mm for under $3/box with home cast powder coat bullets. I love my 9mm AR but this seems $$ when I could just use a blow back and use a magwell adapter. ASC mags aren’t that far off full price but I bought 6 when I saw em for $13 each.

    • I believe they are licensed by CMMG from MEAN Arms, manufacturers of the EndoMag. The CMMG 9 ARC version only works with CMMG radial delayed blowback uppers, while the EndoMag works with standard blowback uppers using Glock or Colt cut bolts. Both versions have a last round bolt hold open follower.

      • That’s unfortunate. The Endomag has an integral ejector made of plastic, and they quit working when it gets damaged

  2. At $26 per adapter I think you’d be better off getting a magwell block and going Colt or Glock financially speaking. Plus, you’ll have more “hi-caps” on hand for the next (D) administration.

  3. I’d rather just have an AR that uses Glock mags to shoot 9mm or the old style Colt adapter and mags. Why bother with a magazine that shoots 9mm that’s the same size as the standard 5.56 magazines? Who cares if it costs a few bucks more to be able to use Glock or Colt style mags, you’d still be spending money on this CMMG setup.

    This is as dumb as it gets.

    BTW, I’m getting tired of these topics that are basically just advertisements. Where’s the commentary by the writer? Everything in this topic was a copy/paste job.

  4. A more cost effective plan is the Ruger PC Carbine, made for 9mm and .40S&W. Buy one of those and a pile of Ruger or Glock magazines for the same price as the upper. I already have at least a dozen Ruger mags to fit one.

    Good at least up to 33 round Glock mags.

    I’ve seen videos of 50 and 100 round drums for Glock, but those appear to jam in the Ruger PC Carbine. Just a guess, not enough support for all that weight causing the long neck of the drum to flex.

      • I’ve seen videos of drums working on rifles and pistols where the full riser (the “normal” height part of the assembly) is inside the gun.

        But the Ruger PC Carbine has many videos showing perfect operation with up to 33 round magazines. Some I’ve seen were Pro-Mag. That’s surprising, and far less expensive than a specialized AR upper and special magazines for it.

  5. As an owner of a transferable M16, I’m excited about the 9MM conversion mags. I won’t run a magwell adapter in my lower, but I will try these out. It’s good to have upper options (currently 22LR, 5.56, 7.62×39, and 300 BLK). Now I need MEAN Arms or CMMG to make a 45ACP conversion insert.

    Note: The CMMG 9 ARC conversion mag only works with CMMG radial delayed blowback uppers, while the MEAN Arms EndoMag works with standard blowback uppers using Glock or Colt cut bolts. Both versions have a last round bolt hold open follower.

  6. You can also convert a smooth bore shotgun into a rifle using caliber adapters. They even have them for the Judge and Governor. I have the 380 adapters for my Judge. And for $150 its less than buying a second firearm.

    “NEW Rifled adapters for Taurus Judge The JURY series 380acp” 8 min long

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