Product Preview: CMMG 9 AR Conversion Adapters

posted on October 29, 2019

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

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



The Winchester Model 94: History & Disassembly

Compact, reliable and powerful, Winchester's Model 1894 lever-actions may not have the popularity it once had with Western settlers, prospectors, law enforcement officers, hunters and ranchers, but its legacy remains today and is a fan favorite in Winchester's current product line.

NRA Gun of the Week: Fabarm USA Autumn

On this week’s “Gun of the Week” video preview, American Rifleman examines a first from Fabarm, a side-by-side break-action shotgun called the Autumn.

The Armed Citizen® Sept. 17, 2021

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

EOTech Launches Anti-Counterfeit Measures

EOTech has launched a campaign targeting those who create and sell illegal copies of its military sighting systems.

The .405 Winchester: History and Performance

Now largely a forgotten footnote in cartridge development, the .405 Winchester was once the most powerful rimmed cartridge capable of use in a lever-action rifle and was a favorite of Theodore Roosevelt.

Colt Mustang .380 ACP: The Pocket-Size 1911

Based off the classic 1911 design, the small Colt Mustang chambered in .380 ACP is easily concealable and shares the same classic look in its tiny frame.


Get the best of American Rifleman delivered to your inbox.