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

Staccato P4x Review 1
Staccato P4x Review 1

First Impressions of the Staccato P4X

Down in Texas, Staccato launched a new pistol to celebrate America's 250th anniversary: the P4X. One can hardly blame them considering that the company's entire product line is based on the 1911, arguably the most American of handguns.

A Big Third Circuit Ruling on America’s Rifle

In an appeal of a case the NRA filed in 2018, the U.S. Court of Appeals for the Third Circuit struck down New Jersey’s ban on “assault weapons” and “large capacity” ammunition magazines as unconstitutional.

Top Cop: How an Armed American Saved President Trump’s Life

An NRA Benefactor Member and NRA Certified Law Enforcement Patrol Rifle Instructor, Sergeant Aaron Zaliponi likely saved the life of President Trump in Butler, Pa. For these reasons, the NRA has selected him as the 2025 Law Enforcement Officer of the Year.

Review: Rock River Arms A1 Carbine SBR

The Rock River Arms A1 SBR is just plain cool, and there’s little justification needed beyond that for picking up a new gun. It’s a mixture of throwback, retro and nostalgia with a bayonet lug, and you just can’t go wrong there.

The Armed Citizen® July 20, 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.

Plinking Perfect: 5 Must-Haves for Your Next Rimfire Shoot

What better way to celebrate 250 years of freedom than to go out plinking this summer? Here are five great products that will make your next rimfire range trip better than ever before.

Interests



Get the best of American Rifleman delivered to your inbox.