Gun of the Week: CMMG Mk4 RCE

by
posted on June 23, 2014
** 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 introduced the Mk 4 RCE this year as one of the company’s premier new rifles. It features a 16 inch 416 stainless steel, medium-taper-profile barrel and is available in 5.56 NATO and .300 AAC Blackout. The rifle comes equipped with the company’s proprietary SV muzzle brake and RKM14 KeyMod handguard, which allows for all kinds of customization options. The Mk 4 RCE also comes with a Geissele SSA 2-Stage trigger, Magpul’s MOE pistol grip, MOE trigger guard and CTR buttstock as standard features.

What stands out on the RCE, of course, is the new KeyMod fore-end. This relatively new modular system allows plenty of customization without the need for full rails. Accessories can be added precisely where the shooter can best use them, with minimal tools needed. KeyMod-friendly items thread directly into the system, while 1913-style Picatinny rails can be attached for everything else. It’s a tidy, useful system that really opens up how lights, lasers, foregrips and other attachments can be added to an AR-15 style rifle.

Technical Specifications:

Caliber: 5.56mm/300 BLK
Barrel: 16.1" medium weight taper profile
Muzzle: CMMG SV brake, threaded 1/2-28
Hand Guard: CMMG RKM14 KeyMod hand guard
Furniture: Magpul MOE pistol grip, MOE carbine stock
Receiver: Forged 7075-T6 AL M4 type upper, AR15 type lower
Trigger: Geissele Automatics SSA
Weight: 6.7 lbs. (unloaded)
Length: 34” (Stock Collapsed)
MSRP: $1,399.95

Latest

2026 New Suppressor Guide
2026 New Suppressor Guide

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.

Review: TriStar KR.22

Manufactured by Kral Arms in Turkey, the TriStar Arms KR.22 is a lightweight semi-automatic that offers everything you need to get started or to perfect what you’ve learned over the years.

Safe Space: 5 Must-Have Accessories to Organize Your Gun Safe

It's a perennial problem for gun owners: not enough safe space. Here are five organizing products that will help you squeeze a bit more in your existing gun safe before you have to run out and buy another.

EAA's Witness2311 CMX XXX & SC9 XXX: A More Practical 2011 Design?

New for 2026, EAA Corp. is downsizing the Witness 2311 CMX design with the CMX XXX and SC9 XXX, two handguns that are built around an entirely new magazine.

Interests



Get the best of American Rifleman delivered to your inbox.