Colt M4 Carbine CR6920 5.56 NATO 16.1″ 30rd Matte Black
Pros & cons
What works
- Uses forged 7075-T6 aluminum receivers - the same specification as military M4 contracts.
- Weighs 6.9 lbs unloaded - 0.8 lbs lighter than many comparable heavy-barreled AR-15 models.
- Includes a genuine 30-round Magpul PMAG, retailed separately at $13-$15.
- 1:7 twist rate barrel stabilizes heavier 62-77 grain ammunition effectively for longer-range use.
Trade-offs
- No included hard case - adds $40-$90 for proper transport and storage.
- Direct gas impingement system fouls the bolt carrier group faster than piston systems, requiring cleaning every 300-500 rounds.
- Standard A2 grip and stock may require immediate replacement for ergonomic fit, adding $50-$100 in upgrade costs.
- Matte black hard coat anodizing shows handling wear more quickly than Cerakote or phosphate finishes.
Video review
Expert review
Specs at a glance
About this product
The Colt M4 Carbine CR6920 is a semi-automatic modern sporting rifle chambered for .223 Remington / 5.56 NATO, built around a mil-spec forged 7075-T6 aluminum receiver with a chrome-lined 16.1-inch barrel. It represents the baseline commercial version of the U.S. military's M4 design, delivering serviceable, proven performance without the select-fire capability. Here at Ironclad Armory, we focus on its specifications, its use case, and its honest limitations for the civilian shooter.
What is the Colt M4 Carbine CR6920 used for?
This rifle is primarily used for defensive training and recreational range shooting, designed to duplicate the manual of arms and accessory platform of a duty weapon. Its 1:7 twist rate barrel is optimized for stabilizing heavier 62- and 77-grain 5.56mm ammunition, making it suitable for both standard range rounds and longer-distance steel target sessions. The non-restricted 16.1-inch barrel ensures standard Title I rifle classification, avoiding NFA paperwork, while the included Magpul MBUS rear sight provides an instant backup aiming solution.
How does the Colt M4 Carbine CR6920 compare to the Stevens 334 rifle?
The Colt CR6920 is a faster-firing, modular gas-operated platform, while the bolt-action Stevens 334 in .308 Win is purpose-built for precision. The Colt's advantage is its rate of fire and accessory compatibility for dynamic scenarios; the Stevens 334 is definitively better for sustained, supported shooting at 200+ yards where shot-to-shot consistency is paramount. Choosing between them comes down to intended application: rapid engagement drills versus deliberate, measured accuracy.
What does it weigh and what are the dimensions?
The rifle weighs 6.9 pounds unloaded and measures 35.5 inches from the end of the buffer tube to the muzzle. With the stock fully collapsed, the overall length reduces to 32.3 inches, allowing for easier transport and maneuverability. A loaded 30-round PMAG adds approximately 1.1 pounds, bringing the typical ready-to-fire weight to just over 8 pounds.
Who is this NOT for?
This rifle is not for first-time gun owners intimidated by platform complexity or for budget-focused shooters who want maximum features per dollar. The direct gas impingement system, while reliable, is dirtier than a piston-driven alternative and requires more frequent cleaning after high-round-count sessions. It is also not ideal for hunters seeking ultra-lightweight packages or those restricted by cartridge-specific hunting regulations.
What's in the box?
You receive the complete rifle, one 30-round Magpul PMAG polymer magazine, and the Magpul MBUS folding rear sight installed on the Picatinny rail. Unlike some competitors, this package does not include a hard case, a front sight tool, or a sling, which represents an immediate additional investment of roughly $75 to $120 for proper transport and handling. The A2 birdcage flash hider is installed and torqued to Colt's factory specification.
Is the Colt M4 Carbine CR6920 worth it at $1082.99?
At this price, the CR6920 is worth it for buyers who prioritize the Colt name, proven mil-spec component integrity, and a platform they know will accept standard AR-15 parts without modification. You are paying for the pedigree and quality control over a budget AR that may cut corners on bolt carrier group materials or barrel steel. For purely recreational plinking, a Stevens 555 Sporting O/U shotgun might offer more immediate, straightforward fun for the same budget.
Key attributes
| upc | 098289023513 |
| manufacturer | Colt |
| manufacturer part number | CR6920 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel finish | Black |
| barrel length | 16'' |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 |
| color | Black |
| length | 35.5'' |
| magazine included | 1 x 30-Round |
| model | M4 Carbine |
| number of magazines | 1 30 rd. |
| package height | 3.0 |
| package width | 9.0 |
| product type | AR |
| safety | Lever Action |
| shipping weight | 8.25 |
| sights | Fixed |
| sights type | Adjustable Sights |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is it compatible with standard AR-15 magazines and accessories?
- Yes, the CR6920 accepts any STANAG-pattern magazine and any MIL-STD-1913 Picatinny rail accessory. The upper receiver's flat-top rail has a standard cross-slot spacing of 0.394 inches, guaranteeing fitment for optics, lights, and vertical grips from companies like Vortex, SureFire, and BCM. The carbine-length handguard uses GI-spec diameter and delta ring assembly.
- Does this rifle come with iron sights?
- It comes with a Magpul MBUS polymer rear sight installed and a fixed A2 front sight post integrated into the gas block. The factory ships it this way to provide an immediate backup aiming system that co-witnesses with most micro red dot sights when mounted. You will need to adjust windage and elevation yourself post-zeroing.
- Can I mount a suppressor or muzzle brake on this barrel?
- Yes, the barrel is threaded 1/2"-28 TPI, the standard for .223/5.56mm muzzle devices. However, the A2 flash hider is secured with a crush washer, which must be removed and replaced with a properly torqued shim or spacer when installing a suppressor mount or precision brake. Torque spec is 15-20 ft-lbs for most devices.
- Does it work with a .223 Wylde chambered upper receiver?
- No, the CR6920 uses a standard 5.56 NATO chamber, which is slightly larger and has a longer leade than a .223 Wylde. While it will safely fire both .223 Remington and 5.56 NATO ammunition, for maximum theoretical accuracy with .223 match ammo, the Wylde chamber is superior. For general use, this difference is negligible at ranges under 200 yards.