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

Icarry Springfield Sa35 Polished 1
Icarry Springfield Sa35 Polished 1

I Carry: Springfield Armory SA-35 Polished in a Falco C631 Gorham Holster

In our latest episode of "I Carry" above, we're taking a closer look at the details of the new Springfield Armory SA-35 Polished, and we're packaging it with a high-quality leather holster from Falco Holsters, along with a new EDC knife from Work Sharp.

ATF Suffers Major Cybersecurity Incident

On Aug. 27, the Bureau of Alcohol, Tobacco, Firearms and Explosives announced that an outside group had breached its systems in what it termed a "major incident."

The Armed Citizen® Aug. 28, 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.

A Conversation About Gun-Making in America

Recently, a paper titled “The American Tradition of Self-Made Arms" written by Joe Greenlee, director of NRA-ILA's Office of Litigation Counsel,was cited by a court in an important ruling on frame-or-receiver litigation.

The Model 87 Ultra Special: A Rare Survivor of Ithaca's Final Gamble

In the spring of 1990, an 18-year-old received a shotgun he didn't order. The Ithaca Model 87 Ultra Special he got instead was the last gasp of one of America's most iconic shotgun makers.

As Gun Sales Stay High, Violent Crime Hits a Historic Low

According to a recent report from the FBI on national crime statistics, violent crime has decreased 9.3 percent from 2024, marking the largest year-to-year drop since the 1930s.

Interests



Get the best of American Rifleman delivered to your inbox.