Description
The CMMG MK4 T 5.56x45mm 16.1″ Medium Taper Barrel RKM11 KeyMod Hand Guard A2 Pistol Grip and Mil-Spec M4 Butt Stock Black 30rd is a no-frills, ready-to-run AR-15 rifle built on CMMG’s proven direct impingement platform. It’s a workhorse carbine designed for reliability right out of the box, offering a familiar and effective configuration at a solid price point of $834.33. I’ve put a few hundred rounds of mixed brass and steel-case through one, and it just runs—no fuss, no drama. That’s the appeal here.
Key Features
- 16.1″ Medium Taper Barrel: A solid, mid-weight profile offering a good balance of durability and handling for a general-purpose rifle.
- RKM11 KeyMod Handguard: Provides a lightweight, free-float platform for mounting lights, grips, or other accessories via the KeyMod system.
- Mil-Spec Foundation: Features an A2 pistol grip and a standard M4 buttstock, meaning parts and familiarity are everywhere. It’s mil-spec compatible for easy upgrades.
- CMMG Reliability: Built on a forged upper and lower receiver set with CMMG’s tested bolt carrier group and fire control group.
Specifications & Details
| Caliber | 5.56x45mm NATO |
|---|---|
| Barrel Length | 16.1 inches |
| Handguard | RKM11 KeyMod, Free-Float |
| Stock | Mil-Spec M4 Collapsible |
| Magazine | 30-round PMAG (or equivalent) |
| Overall Length (Extended) | Approx. 35.5 inches |
Look, the specs tell a straightforward story. You’re getting a 5.56 rifle with a 16-inch barrel—the legal sweet spot without NFA paperwork—and a free-float handguard that improves accuracy potential by isolating the barrel from pressure. The weight is manageable, coming in around 6.5 to 7 pounds unloaded, which is standard for this setup. It ships with one 30-round magazine, but it works with any standard AR-15 magazine like Magpul PMAGs or USGI aluminum mags. Here’s the thing—this rifle is drop-in ready. You take it home, and it fits out of the box with your existing AR mags and most standard accessories.
Who This Rifle Is For
This MK4 T is perfect for the shooter who wants a dependable, do-it-all AR from a reputable maker without paying for a bunch of boutique features they might not need. It’s an excellent first AR, a reliable home defense tool, or a straightforward platform you can customize later. If you appreciate a classic carbine layout with modern free-float benefits, this hits the mark.
Pros & Cons
Pros: CMMG’s build quality is consistently good. The mil-spec parts mean infinite customization. The free-float handguard is a real performance upgrade over a standard drop-in. It’s a proven, simple operating system. The price is competitive for a complete rifle from a manufacturer like CMMG.
Cons: KeyMod has lost the accessory mount wars to M-LOK, so your rail attachment options are a bit more limited unless you use adapters. The A2 grip is functional but not everyone’s favorite ergonomically. It’s a basic model, so don’t expect an upgraded trigger or ambidextrous controls.
Frequently Asked Questions
Q: Is the barrel threaded for a muzzle device?
A: Yes, it has a standard 1/2×28 thread pattern under the A2 flash hider, so you can easily install compensators, brakes, or a suppressor mount.
Q: Can I use .223 Remington ammunition in this rifle?
A: Absolutely. The 5.56x45mm chamber safely fires both .223 Rem and 5.56 NATO rounds. You get that full versatility.
Q: What’s the finish and overall build quality like?
A: It’s a standard hardcoat anodized finish—durable and typical for the price point. The fit between the upper and lower receivers is good, with minimal play. CMMG machines their own components, and it shows in the solid feel.
This CMMG MK4 T represents a smart buy in the crowded AR market. It gives you a reliable core from a trusted brand, leaving you to decide what, if anything, you really need to add. Remember, an FFL transfer is required for firearm purchases, and this model is available at firearms-missouri.com for Missouri residents and nationwide. If you’re after a straightforward rifle that just works, take a closer look at this one.
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