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

Ruger Beretta Agreement F Updated
Ruger Beretta Agreement F Updated

Beretta Holding and Ruger Agree to Partnership

Sturm, Ruger & Co., Inc. and Beretta Holding S.A. have announced that both companies are entering into a strategic cooperation agreement.

Return of the Encore: T/C Arms Brings Back Its Iconic Single-Shot

In 2024, former owner Gregg Ritz purchased Thompson/Center Arms. Now the company has introduced a modern take on its classic Contender/Encore concept: the ENCORE PROHunter.

7 New ARs for 2026

While it's certainly a saturated marketplace these days, the AR-15 has never been more popular with American firearm enthusiasts, and many manufacturers are continuing to feed the need with new options loaded with new features.

The Armed Citizen® May 4, 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.

The Drawbacks of Being a Numbers-Oriented Gun Guy

Like any hobby or pastime that is in any way even vaguely related to machines or technology, firearms attract a (possibly) disproportionate number of “right-brained,” STEM-oriented personalities who like numbers.

First Look: MDT Hand Cannon Slingshot

Slingshots are fun, but they can also be a legitimate backup defensive tool—in 2023, a 13-year-old Michigan boy saved his 8-year-old sister from being kidnapped by using a $3 slingshot to fire a marble and a rock at the assailant, striking him in the chest and head.

Interests



Get the best of American Rifleman delivered to your inbox.