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

25 Weatherby RPM
25 Weatherby RPM

Weatherby Revs Up With Its 25 WBY RPM

The 25 Weatherby RPM might just be the best quarter-bore rifle cartridge yet.

Beretta Releases 500th Anniversary Medal

In honor of its quincentennial, Beretta is offering a keepsake medal with the purchase of certain firearms in 2026.

New for 2026: Mission First Tactical Ultra Low Ride Holster

Mission First Tactical now offers a deep-concealment version of its Boltaron staple.

New for 2026: Smith & Wesson Night Guard Revolvers

Smith & Wesson brings back the Night Guard series of revolvers in .44 Special and .357 Magnum.

Battle On The Border: Pancho Villa’s Raid On America

In March 1916, Americans living in the quiet town of Columbus, N.M., suddenly found themselves attacked by Mexican bandits, and many citizens sought to arm themselves and fight back, both during the raid and afterward.

The Armed Citizen® Feb. 9, 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.

Interests



Get the best of American Rifleman delivered to your inbox.