Description
The CMMG MK4 Rifle, .22 Nosler, 22″, 10rd, Keymod Handguard, Black Hard Coat Anodized is a purpose-built, high-velocity AR-platform rifle chambered in the potent .22 Nosler cartridge. It’s designed for shooters who want flat trajectory and extended reach in a lightweight, familiar AR-15 format, featuring a 22-inch barrel for optimal velocity and a durable Keymod handguard for accessory mounting. This rifle ships to Missouri and compliant US states.
I’ve put a few hundred rounds of .22 Nosler through this platform, and the performance is distinct from your standard .223 Remington. The longer 22-inch barrel really lets that sleek little projectile stretch its legs, pushing velocities that make you rethink what a .22 caliber can do. Here’s the thing—it’s not just another AR. It’s a dedicated tool for a specific job.
Key Features
- .22 Nosler Chambering: Delivers significantly higher velocity than .223/5.56 from similar barrel lengths, offering a flatter trajectory and extended effective range.
- 22-Inch Barrel: Optimized for the .22 Nosler cartridge to maximize powder burn and velocity potential.
- Keymod Handguard: Provides a lightweight, ergonomic platform for mounting lights, grips, and bipods using the Keymod attachment system.
- Black Hard Coat Anodized Finish: A durable, corrosion-resistant finish that stands up to hard use and the elements.
- 10-Round Magazine: Ships with a single 10-round magazine, a common capacity for precision-oriented or hunting applications.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | .22 Nosler |
| Barrel Length | 22 Inches |
| Handguard | Keymod |
| Finish | Black Hard Coat Anodized |
| Magazine Capacity | 10 Rounds |
| Action | Direct Impingement (AR-15 Platform) |
The rifle is built on CMMG’s proven AR-15 platform, which means a huge degree of parts commonality and customization potential. At a weight I’d estimate around 7.5 to 8.5 pounds unloaded, it balances well for offhand shooting or from a supported position. The best part? It’s mil-spec compatible where it counts, so many of your standard AR-15 triggers, grips, and stocks will fit out of the box with no gunsmithing required. This compatibility extends to using common tools and knowledge, making it a familiar yet specialized piece.
Who This Rifle Is For
This MK4 is for the shooter who has the standard AR bases covered and is looking for a specialized tool. It’s ideal for varmint hunters who need reach and minimal wind drift, or for target shooters wanting to explore a high-performance, low-recoil cartridge. It’s also a smart choice for those building a versatile battery of AR uppers, as this dedicated .22 Nosler upper would pair perfectly with a standard lower you might already own. Given its $1019.89 price point, it’s an investment in a specific capability rather than a general-purpose rifle.
Pros & Cons
Pros: The .22 Nosler delivers outstanding velocity—think 3,300+ fps with 55-grain loads—which translates to a laser-flat shot. The 22-inch barrel harnesses that power perfectly. The Keymod handguard keeps weight down, and the CMMG build quality is consistently solid. It fills a niche that .223 can’t quite reach without handloading hot.
Cons: .22 Nosler ammo isn’t on every shelf; you’ll likely be ordering it online, and cost-per-round is higher than .223. The cartridge also has a reputation for shorter barrel life compared to .223, though for most hunters and recreational shooters, that’s a non-issue over thousands of rounds. The 10-round capacity is standard but may feel limited to some.
Frequently Asked Questions
Q: Can I use standard .223/5.56 magazines with the .22 Nosler?
A: No, you cannot. The .22 Nosler case has a different shoulder angle and slightly larger base diameter. It requires specific .22 Nosler magazines, which this rifle includes. Do not attempt to use .223 magazines.
Q: Is the .22 Nosler just a necked-down .223 case?
A: Not exactly. It’s based on the 6.8 SPC case, necked down to .22 caliber. This provides more case capacity than a .223, which is the key to its higher velocity. You cannot form .22 Nosler brass from .223 brass.
Q: Will this upper receiver fit on any AR-15 lower?
A: Yes, it should. The CMMG MK4 upper is designed to work with standard mil-spec AR-15 lower receivers. You simply pair it with a complete lower, like one from Aero Precision or Palmetto State Armory, and you have a complete rifle. Remember, an FFL transfer is required for firearm purchases of complete lowers or complete rifles.
If you’re looking to step into a high-velocity, specialized AR platform that handles differently than the crowd, the CMMG MK4 in .22 Nosler deserves a close look. Check availability at firearms-missouri.com for Missouri residents and nationwide.
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