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

4 MAT 49 Viet Minh The French National Forces Paratroopers
4 MAT 49 Viet Minh The French National Forces Paratroopers

The MAT-49: France's Mid-20th Century SMG

After World War II, the French military was left with a hodgepodge of leftover submachine guns. After several years, the army consolidated on a standard service rifle, the MAS-49, and a standard submachine gun: the MAT-49.

New for 2026: Pedersoli 1805 Baker Rifle

Pedersoli now offers an authentically styled 1805 Baker Rifle for collectors, re-enactors and enthusiasts.

Gun of the Week: Benelli M4 EXT Tactical Shotgun

Benelli's semi-automatic workhorse shotgun continues to evolve and improve.

The Armed Citizen® Feb. 6, 2026

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

New for 2026: Tool Collections from Real Avid

Real Avid just released some new tool collections to help with cleaning, optics mounting and other firearm-related chores.

Review: Bersa M2XI Pistol

The M2XI represents a new area for Argentinian firearm manufacturer Bersa, and this budget 2011 shoots above its price point.

Interests



Get the best of American Rifleman delivered to your inbox.