CMMG RESOLUTE® MK4 — 5.56×45 NATO, 16.1" Barrel, 30-Round, Sniper Grey | Model 55A9D0B-SG / 55A9D0BSG | UPC 810144722795
Mission-Ready, Range-Proven, Finished in Sniper Grey
The CMMG RESOLUTE® MK4 in 5.56×45 NATO is built for shooters who want a reliable, modern AR-pattern rifle configured for all-day training, home/property defense, and practical competition. Anchored by a 16.1" barrel for balanced velocity and maneuverability, this RESOLUTE MK4 pairs CMMG’s attention to detail with the rugged good looks of a Sniper Grey Cerakote® finish. Expect smooth cycling, optics-ready ergonomics, and free-float accuracy—all wrapped in a durable package that’s easy to upgrade as your needs evolve.
Caliber: 5.56×45 NATO / .223 Rem compatible • Capacity: 30+1 (where legal) • Finish: Sniper Grey • Models: 55A9D0B-SG / 55A9D0BSG • UPC: 810144722795
Why Choose the RESOLUTE MK4?
Proven 5.56 NATO Performance
From training carbine to duty-ready rifle, 5.56 NATO delivers accessible ammo, controllable recoil, and a deep ecosystem of mags, parts, and upgrades.
16.1" Barrel — The Sweet Spot
The 16.1" length blends velocity and handling for general-purpose use. It’s long enough to stabilize common bullet weights while staying quick on target indoors or around barricades.
Free-Float Precision
A free-float handguard (length varies by configuration) helps preserve point of impact when running a sling, barricade, or bipod—supporting tighter groups and confident zero retention.
Optics-Ready Upper with Accessory Real Estate
A full-length Picatinny top makes it simple to mount a red dot, LPVO, or irons. M-LOK® slots on the handguard accept lights, grips, QD sling cups, and other essentials (configuration dependent).
Sniper Grey Cerakote®
Cerakote offers excellent corrosion and abrasion resistance while the Sniper Grey colorway gives the rifle a premium, low-glare aesthetic that pairs well with black or two-tone accessories.
Key Features at a Glance
Caliber: 5.56×45 NATO (.223 Rem compatible)
Barrel: 16.1" (medium profile; threaded muzzle*)
Handguard: Free-float, M-LOK® compatible (length varies by SKU)
Receiver: AR-15 pattern, optics-ready Picatinny top
Furniture: 6-position stock and A2- or upgraded-style grip (varies by batch)
Controls: Standard AR controls; accepts STANAG pattern magazines
Finish: Sniper Grey Cerakote® (upper/lower, and handguard depending on configuration)
Capacity: 30 rounds (where legal)
Model / UPC: 55A9D0B-SG / 55A9D0BSG • 810144722795
*Typical 5.56 threading is 1/2×28, but always verify thread pitch on your serialized spec card before purchasing muzzle devices or suppressor mounts.
Note: Small components (trigger style, muzzle device, stock, grip, handguard length) may vary by production run or retailer bundle. Check your product label/spec card for exact details.
What You’ll Notice at the Range
Soft, Predictable Recoil
The 5.56 impulse is easy to manage, encouraging faster follow-up shots and tighter splits—especially with a quality muzzle device.
Consistent Accuracy
Free-float geometry helps keep bipod/sling tension off the barrel. That translates to repeatable groups and stable zero across positions and weather.
Accessory-Friendly
M-LOK slots and a full-length top rail keep your mounting options open. Set up a white light, laser, or handstop exactly where you want it.
Ideal Use Cases
General Purpose Carbine: Training, home/property defense, patrol rifle builds
Practical Competition: 2-Gun/3-Gun and carbine matches
Ranch/Field Rifle: Reliable, easy-handling platform with widely available ammo
Skill Builder: Perfect foundation for new shooters moving into the AR ecosystem
Smart Setup Recommendations
Optic: A micro red dot for speed or an LPVO (1-4×/1-6×) for distance flexibility
Light: Compact M-LOK® weapon light with a momentary tailcap or remote switch
Sling: Two-point QD sling for carry and positional stability
Muzzle Device: Comp/flash hider or suppressor (where legal)—confirm thread pitch first
Magazines: Quality 30-rd STANAG mags; mark and rotate for reliability
Technical Specifications (General)
Platform: AR-15 / Mk4
Caliber: 5.56×45 NATO
Barrel Length: 16.1" (threaded muzzle; pitch varies—verify)
Gas System: Carbine or mid-length (varies by SKU)
Handguard: Free-float, M-LOK® compatible
Upper/Lower: Aluminum, optics-ready Picatinny
Finish: Sniper Grey Cerakote®
Capacity: 30+1 (where permitted)
Models: 55A9D0B-SG / 55A9D0BSG
UPC: 810144722795
Always refer to your rifle’s serialized spec card for definitive configuration.
Frequently Asked Questions
Q: Is the barrel threaded from the factory?
A: Yes, RESOLUTE rifles commonly ship with a threaded muzzle, but always confirm pitch (most 5.56 barrels are 1/2×28).
Q: What magazines does it use?
A: Standard AR-15/STANAG pattern magazines from reputable manufacturers.
Q: Can I run it suppressed?
A: Typically yes. Use an appropriate 1/2×28 mount (if applicable), and confirm reliable cycling with your chosen ammo. Local laws apply.
Q: What’s the difference between RESOLUTE, ENDEAVOR, and BANSHEE?
A: RESOLUTE is CMMG’s general-purpose carbine line (16" class). ENDEAVOR targets precision with longer barrels; BANSHEE focuses on ultra-compact builds.
SEO-Rich Highlights & Buyer Keywords
CMMG RESOLUTE MK4 5.56 with 16.1" barrel, 30-round capacity
Sniper Grey Cerakote AR-15 rifle, free-float M-LOK handguard
Optics-ready Picatinny upper; general-purpose carbine for training, defense, competition
Model 55A9D0B-SG / 55A9D0BSG, UPC 810144722795
Reliable 5.56 NATO AR-15, upgrade-friendly platform
Meta Title (SEO)
CMMG RESOLUTE MK4 — 5.56 NATO, 16.1", 30-Round, Sniper Grey | 55A9D0B-SG / 55A9D0BSG | UPC 810144722795
Meta Description (SEO)
Meet the CMMG RESOLUTE MK4 in 5.56 NATO with a 16.1" barrel, free-float M-LOK handguard, optics-ready rail, and Sniper Grey Cerakote. 30-rd capacity (where legal). Models 55A9D0B-SG / 55A9D0BSG, UPC 810144722795.
Structured Data (Product Schema JSON-LD)
Responsible Use Reminder
Comply with all local, state, and federal laws regarding firearm purchase, transport, and magazine capacity. Verify your rifle’s thread pitch and configuration on the product label, and perform a full function check with your preferred ammunition before duty or competition use. Practice safe handling and secure storage.
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