Description
I remember the first time I pulled a CMMG Resolute 100 MK4 out of the box. It wasn’t just another black rifle—it was a complete, ready-to-run platform that felt solid and purpose-built right from the start. The CMMG Resolute 100 MK4 5.56mm 16.1″ Barrel, 6-Position Black Stock Black Hardcoat Anodized, 30rd is a factory-built, direct-impingement AR-15 rifle designed for reliability and performance. It’s a turn-key solution for shooters who want a quality rifle without the hassle of building from parts, and it’s available at firearms-missouri.com for Missouri residents and nationwide.
Here’s the thing—after putting a few hundred rounds of mixed brass and steel-case ammo through it, the Resolute 100 MK4 just ran. No fuss, no drama. That’s the point of a rifle like this. The 16.1-inch barrel is the sweet spot for the 5.56 NATO cartridge, giving you good velocity without the unwieldy length of a 20-inch, and it’s still maneuverable. The 1:7 twist rate handles the heavier bullets you might want for longer shots, but it’ll also stabilize the lighter, cheaper stuff just fine for plinking. At just over 6.5 pounds unloaded, it’s light enough for a long day at the range or in the field.
The heart of any AR is its upper and lower receiver fit, and CMMG gets this right. The black hardcoat anodizing is durable and provides a consistent finish. The fit between the receivers on my sample was tight, with no noticeable wobble—a sign of good machining tolerances. The rifle uses a standard mil-spec trigger, which is predictable and functional. Is it a match-grade trigger? No, but it’s a perfect starting point that’s safe and reliable, and it’s easily upgraded down the line if you want. The 6-position collapsible stock is also mil-spec, which means you have a huge aftermarket of compatible stocks if you ever want to swap it. It locks up solidly at each position.
One of the best features is that this rifle is drop-in ready. You don’t need to be an armorer to get it running. It ships with one 30-round magazine, which is a nice touch. The rifle is built on a standard AR-15 platform, so parts compatibility is excellent. Want to change the handguard? It’s compatible with a vast array of aftermarket options from brands like Magpul, BCM, or Midwest Industries. The same goes for grips, stocks, and triggers. This is a rifle you can truly make your own, but you can also just take it out and shoot it as-is.
| Caliber | 5.56 NATO / .223 Remington |
| Barrel Length | 16.1 inches |
| Twist Rate | 1:7 |
| Stock | 6-Position Collapsible, Mil-Spec |
| Finish | Black Hardcoat Anodized |
| Magazine Capacity | 30 Rounds (1 included) |
Pros: Excellent out-of-the-box reliability. Solid construction with good receiver fit. Uses a ubiquitous, proven direct-impingement system. Exceptional parts compatibility with the AR-15 ecosystem. The 16-inch barrel is a versatile, all-around length. Comes ready to shoot.
Cons: The mil-spec trigger is functional but not exceptional—it’s a common first upgrade. The handguard is basic; many shooters will want to add rails or a free-float option. At a price point of $1071.50, it’s competing with some other great factory rifles, so it’s an investment.
So who is this rifle for? It’s perfect for the shooter who wants a dependable, no-nonsense AR-15 as a first rifle, a duty-ready backup, or a trusted workhorse. It’s for the person who appreciates the simplicity of the direct-impingement system and the absolute certainty of parts commonality. It’s also a fantastic foundation for a custom build, as you can slowly upgrade components over time. If your priority is a rifle that works every time you pull the trigger and gives you a platform to grow with, the Resolute 100 MK4 deserves a hard look.
Frequently Asked Questions
Q: Is the barrel threaded for a muzzle device?
A: Yes, the 16.1-inch barrel comes with a standard 1/2×28 thread pattern, so you can easily add a flash hider, compensator, or suppressor mount. A standard A2 birdcage flash hider is installed from the factory.
Q: Does this rifle have a forward assist and dust cover?
A: Yes, it includes both a forward assist and a spring-loaded dust cover. These are classic mil-spec features that many shooters prefer for manual bolt closure and keeping debris out of the action.
Q: What is the process for purchasing this online?
A: All firearm purchases require an FFL transfer. You can purchase the rifle on our site, and we will ship it to your chosen licensed Missouri FFL dealer, who will then complete the necessary background check and transfer it to you. We recommend contacting your preferred FFL beforehand to confirm their fees and procedures.
If you’re looking for a straightforward, well-built AR-15 that gets the fundamentals right, check out the CMMG Resolute 100 MK4 on our site.
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