Description
The CMMG MK4 3 Gun Shooter 5.56mm 18″ Barrel SV Brake, RKM14 KeyMod Hand Guard, Magpul MOE Pistol Grip & Rifle Butt Stock, 30 Round Mag is a purpose-built competition rifle. It’s an AR-15 platform rifle configured from the factory for the speed and precision demands of 3-Gun matches, featuring an 18-inch barrel for optimal velocity and a muzzle brake to manage recoil. I’ve put a few hundred rounds of 5.56 through this setup, and it’s clear CMMG built this to run fast and flat right off the line.
Key Features
- 18″ 5.56 NATO Barrel: The sweet spot for 3-Gun, giving you better ballistics than a 16″ carbine without the unwieldy length of a 20″ rifle.
- SV Muzzle Brake: CMMG’s radial port brake does a solid job of taming muzzle rise. You’ll stay on target for faster follow-up shots.
- RKM14 KeyMod Handguard: A lightweight, free-float rail that gives you plenty of real estate for grips, lights, or other accessories. It’s a clean, no-fuss system.
- Magpul MOE Furniture: The MOE pistol grip and rifle stock are proven, ergonomic upgrades over basic mil-spec parts. They just feel right in the hands.
- Ready to Compete: This rifle comes configured and drop-in ready. You can take it from the box to the range—or the match—with zero gunsmithing required.
Specifications & Details
| Spec | Detail |
|---|---|
| Caliber | 5.56x45mm NATO |
| Barrel Length | 18 inches |
| Handguard | CMMG RKM14 KeyMod, 14-inch |
| Stock & Grip | Magpul MOE Rifle Stock & MOE Grip |
| Muzzle Device | CMMG SV (Slotted Vented) Brake |
| Magazine | 30-round PMAG (or equivalent) |
The rifle’s overall length with the stock extended is right around 38.5 inches, and you’re looking at a weight of approximately 7.5 pounds unloaded. That 18-inch barrel is the heart of the system. It pushes a 55-grain bullet to around 3,000 feet per second, giving you a flatter trajectory and more consistent performance at the medium-range targets common in 3-Gun. The rifle uses a standard mil-spec lower receiver, which means it’s compatible with a huge range of AR-15 triggers and parts if you decide to personalize it later. For the price of $1166.91, you’re getting a complete, competition-oriented package that would cost significantly more to piece together yourself.
Who This Rifle Is For
Look, this isn’t a general-purpose “do everything” AR. It’s built for a specific shooter. First and foremost, it’s for the new or intermediate 3-Gun competitor who wants a rifle that’s already set up to be competitive without the hassle and expense of a custom build. It’s also a great option for the shooter who wants a high-quality, accurate 5.56 rifle for longer-range target work or varmint hunting where that extra barrel length pays off. If your primary need is a home-defense carbine for tight quarters, the 18-inch length might be a hindrance—that’s just being honest.
Pros & Cons
Pros: The out-of-the-box configuration is spot-on for its intended use. The SV brake is effective, the Magpul furniture is a major upgrade, and the free-float handguard ensures consistent accuracy. It’s a turnkey solution that saves you time and money on common aftermarket upgrades. This rifle is available at firearms-missouri.com for Missouri residents and nationwide, following all applicable laws with an FFL transfer required for firearm purchases.
Cons: KeyMod has largely been supplanted by M-LOK in the accessory market, so your mounting options might be slightly more limited unless you use adapters. The rifle stock is a fixed MOE model, not an adjustable carbine stock, which some shooters may prefer for a more customizable length of pull. That said, the fixed stock is inherently more stable for precision shooting.
Frequently Asked Questions
Q: Is this a complete rifle, or just an upper receiver?
A: This is a complete, functional rifle. It includes the lower receiver, upper receiver, barrel, handguard, stock, grip, and a magazine. It ships as a full firearm and requires an FFL transfer.
Q: Can I use .223 Remington ammunition in this 5.56mm rifle?
A: Yes, you can safely fire both 5.56x45mm NATO and .223 Remington ammunition in this rifle. The chamber is designed to handle the higher pressures of 5.56, making it dual-purpose.
Q: What kind of optic would you recommend for 3-Gun with this setup?
A: A low-power variable optic (LPVO) in a 1-6x or 1-8x range is the current popular choice, as it handles close-up hoser stages and longer-range precision shots. A robust red dot like an Aimpoint PRO or Holosun 510C is also a fantastic, simpler option.
If you’re ready for a rifle built to handle the clock and the course, this CMMG MK4 3 Gun Shooter package is a seriously smart place to start.
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