Description
The CMMG MK3 3GR 3 Gun Shooter .308 18″ SS Barrel, RKM15 Hand Guard Magpul MOE, 20 Rd Mag is a purpose-built competition rifle designed for the 3-Gun circuit. It combines the power of the .308 Winchester/7.62x51mm NATO cartridge with an 18-inch stainless steel barrel and a lightweight Magpul MOE stock, offering a balance of accuracy, recoil management, and speed for multi-stage shooting events. This rifle is available at firearms-missouri.com for Missouri residents and nationwide.
Key Features
- Competition-Ready .308 Platform: Delivers the power and downrange energy for long-range steel targets often found in 3-Gun matches, giving you an edge over smaller calibers.
- 18-Inch Stainless Steel Barrel: Provides an optimal blend of velocity and maneuverability. The stainless steel construction aids in heat dissipation during rapid-fire strings.
- RKM15 Handguard & Magpul MOE Furniture: The free-float RKM15 handguard maximizes accuracy, while the Magpul MOE stock and grip offer proven ergonomics and adjustability for a custom fit.
- Included 20-Round Magazine: Comes ready with a standard-capacity mag, hitting a sweet spot for most stage round counts without being overly bulky.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | .308 Winchester / 7.62x51mm NATO |
| Barrel | 18″, Stainless Steel |
| Handguard | CMMG RKM15 Free-Float |
| Stock | Magpul MOE |
| Grip | Magpul MOE |
| Magazine | 20-Round .308 PMAG (Included) |
Weighing in at approximately 9.5 lbs unloaded, the MK3 3GR has a heft that helps tame .308 recoil impulse, making follow-up shots faster—a critical factor in timed competition. The rifle is built on a mil-spec compatible AR-10 pattern, which means a huge aftermarket exists for triggers, charging handles, and other upgrades. That said, the out-of-the-box configuration from CMMG is notably complete, requiring no immediate gunsmithing to be match-ready. For a dedicated .308 competition gun priced at $1625.72, the value proposition is clear when you compare it to custom-built alternatives that can easily climb past the $2,500 mark.
Who This Rifle Is For
This rifle is for the 3-Gun competitor who wants to step up from 5.56mm or shoot in a Heavy Metal division. It’s also a solid pick for a hunter who wants a versatile, accurate semi-auto for medium to large game, or a shooter who simply prefers the .308 platform for long-range recreational shooting. The 18-inch barrel length, a key data point, makes it legal in all 50 states without NFA concerns, unlike shorter SBR configurations.
Pros & Cons
Pros: The .308 caliber ensures reliable target engagement at extended ranges common in 3-Gun. The included Magpul furniture and free-float handguard are practical, proven upgrades you’d likely add anyway. The total package price represents a significant saving over sourcing parts individually and assembling yourself. Look, it’s a turnkey solution for a niche need.
Cons: Ammunition cost is higher than 5.56mm, which impacts practice budgets. The rifle is heavier than an AR-15, which can affect transition speed between targets. The 20-round magazine, while included, may be less than ideal for some high-round-count stages, though additional Magpul PMAG .308 M3 magazines are widely available and affordable.
Frequently Asked Questions
Q: Is this rifle compatible with standard AR-10 parts and magazines?
A: Yes. The CMMG MK3 3GR is built to a common AR-10/SR-25 pattern. It should be compatible with many aftermarket triggers, bolts, and accessories designed for this platform, and it accepts Magpul PMAG .308 M3 magazines and other SR-25 pattern mags.
Q: How does this compare to a 5.56mm rifle for 3-Gun?
A: The .308 hits harder, making long-range steel falls more reliably, which can save time. The trade-off is more recoil, heavier weight, and higher ammo costs. It’s a tool for a specific task—dominating the long bay—where a 5.56mm rifle might be faster on close-in hoser stages.
Q: What optics mount well on the RKM15 handguard?
A: The handguard features a full-length Picatinny top rail, allowing direct mounting of any standard scope rings or red dot sights. For a 3-Gun setup, a 1-6x or 1-8x low-power variable optic (LPVO) in a quality mount from brands like Vortex, Primary Arms, or Leupold is a popular and effective choice.
Ready to add serious long-range capability to your competition arsenal or hunting lineup? The CMMG MK3 3GR offers a focused, value-driven package that gets you on the course or in the field without the hassle of a custom build. FFL transfer required for firearm purchases.
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