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

Heckler & Koch VP9CC
Heckler & Koch VP9CC

Review: Heckler & Koch VP9CC

HK’s new VP9CC offers VP9 features in a micro-size pistol.

Former Barnes Bullets CEO Randy Brooks Passes Away

Randy Brooks, former president and CEO of Barnes Bullets, passed away on Aug. 27 peacefully in his Mona, Utah, home.

NRA-ILA Names Patriot Mobile Official Partner of the 2026 NRA Gun Bus Battleground Tour

America’s only Christian conservative wireless provider, Patriot Mobile, will keep the tour connected as the NRA-ILA team takes the Second Amendment fight on the road.

New Suppressors for 2026: A Full Guide

With the removal of the $200 NFA tax stamp on suppressors, the only sound reverberating across the firearms landscape is “cha-ching.”

MDT Now Offering Lone Peak Arms Rifle Actions

Earlier in 2026, MDT announced that it had acquired Lone Peak Arms, and now, the company's rifle actions are available to consumers.

The Armed Citizen® Aug. 31, 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.