Product Preview: CMMG 9 AR Conversion Adapters

by
posted on October 29, 2019
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
cmmg-9-arc-adapters.jpg

AR-style pistol-caliber carbines chambered for 9 mm Luger typically require the use of a dedicated 9 mm lower receiver, but CMMG’s 9 AR Conversion (9 ARC) Magazines remove that requirement by allowing any unmodified AR-15 lower to function with the company’s Radial Delayed Blowback 9 mm Luger upper receivers. And taking the versatility of the system even further, CMMG’s 9 AR Conversion Adapters allow any standard (.223 Rem.) 30-round Gen 2 or Gen 3 Magpul PMAGs to be temporarily altered for 9 ARC compatibility. Just remove the magazine’s baseplate retainer and spring, insert the CMMG adapter, compress the spring and slide the factory baseplate back into place. Capable of up to a full 30 rounds of ammunition, the adapters can also be modified to limit capacity to either 10, 15 or 20 rounds. These adapters are available for $30 each, or $80 for a pack of three. For more information, please visit cmmginc.com.

Additional Reading:
NRA Gun of the Week: CMMG Resolute 300 MK4 Rifle
NRA Gun of the Week: CMMG Mk57 Banshee
Product Preview: CMMG RipStock Buttstock Assembly
Tested: CMMG MK4 Banshee .22 LR Pistol

Latest

Smith Wesson Academy Artv 1
Smith Wesson Academy Artv 1

The Smith & Wesson Academy Reopens

One of the latest expansions at S&W's new Maryville facility is the addition of an entirely new training ground, the new home of the legendary Smith & Wesson Academy.

New for 2026: EAA Balikli BLK Bolt-Action Rifles

This year, EAA Corp. expanded its catalog with a new hunting rifle, the Balikli BLK bolt-action, which has high-end features for its price, as well as compatibility with broad aftermarket.

HOUSTON 2026 | The 155th NRA Annual Meetings & Exhibits

Exuberance was the defining spirit of the 2026 NRA Annual Meetings. More than 73,000 attendees packed the George R. Brown Convention Center in Houston to celebrate 250 years of America, concurrent with 155 years of their NRA.

A Landmark Post-Bruen Alignment of the 2nd and 4th Amendments in Maryland

On June 4, 2026, the Appellate Court of Maryland ruled that law enforcement cannot stop and search a person merely because they see a gun—or the outline of one printing from a concealed holster.

Shotshell Basics: Understanding Payloads, Pressures & Performance

A shotgun can be supremely versatile, depending on how it’s loaded. Understanding how shotshells work is difficult, but crucial.

Rock River Arms Celebrates 30 Years in Business

While the company's beginnings go back to 1994, the Rock River Arms story officially started in 1996, meaning that it is celebrating 30 years in business in 2026.

Interests



Get the best of American Rifleman delivered to your inbox.