Cobalt Kinetics CK-PRO-LITE 5.56 NATO 7.5in 30+1 CK Green
Pros & cons
What works
- Weighs 5.8 lb — 1.3 lb lighter than a Daniel Defense DDM4 PDW with similar barrel length
- Includes RCB-6 muzzle device compatible with CGS/SilencerCo suppressors — a $90 value if bought separately
- Ambidextrous safety and charging handle milled into receiver — no added parts needed for left-handed shooters
Trade-offs
- No case or sling included — plan to spend $150+ on a quality soft case and two-point sling
- Extreme muzzle blast and flash from 7.5-inch barrel — requires a suppressor or linear compensator for comfortable indoor use
- Proprietary gas block complicates barrel swaps — requires full disassembly of the handguard and gas system
Video review
Expert review
Specs at a glance
About this product
What is the Cobalt Kinetics CK-PRO-LITE 5.56 AR-15? It's a factory-built short-barreled rifle (SBR) platform combining a 7.5-inch barrel with a registered firearm lower receiver, designed specifically to be bought as an NFA item through a Form 4 transfer. This is a Title II firearm from the moment it's assembled, not a 'pistol' conversion, which dictates its regulatory pathway and intended close-quarters utility. The configuration prioritizes maneuverability over long-range ballistic performance, a trade-off buyers must understand before purchase.
What is the Cobalt Kinetics CK-PRO-LITE used for?
The CK-PRO-LITE is used for confined-space training, vehicle operations, and as a dedicated suppressor host where overall length reduction is critical. With an overall length of approximately 24.5 inches (collapsed), it transitions quickly around barricades and inside simulated structures. The 5.56 NATO chambering retains terminal performance within 150 yards, but the 7.5-inch barrel sacrifices significant muzzle velocity—expect around 2,100 feet per second with M193 ball ammo, a 35% drop from a 16-inch barrel.
How does the CK-PRO-LITE compare to a Stevens 334 .308 bolt-action rifle?
The CK-PRO-LITE is better for rapid, close-range engagements, while the Stevens 334 in .308 Win is superior for precise shots beyond 300 yards. Comparing a semi-auto SBR to a bolt-action rifle highlights application divergence: the Cobalt rifle cycles a 30-round magazine in under 5 seconds, whereas the Stevens delivers sub-MOA accuracy from its 20-inch barrel but requires manual cycling. Choose the CK-PRO-LITE for dynamic CQB scenarios; choose the Stevens for hunting or deliberate long-range work.
What does it weigh and what are the dimensions?
The rifle weighs 5.8 pounds unloaded and measures 24.5 inches with the stock collapsed, or 27.75 inches extended. The 7.5-inch cold hammer-forged barrel has a 1:7 twist rate, and the upper/lower receivers are machined from 7075-T6 aluminum with Type III hardcoat anodizing. The handguard interior diameter of 1.5 inches accommodates most common suppressor mounts, including the included RCB-6 device designed for CGS and SilencerCo Omega mounts.
Who is this NOT for?
This is not for first-time buyers unwilling to navigate the NFA process, which involves a $200 tax stamp, fingerprints, passport photos, and an average 9-month ATF approval wait. It's also a poor choice for hunters needing ethical energy beyond 200 yards, or for shooters on a tight budget—the $2,034.99 MSRP doesn't include the tax stamp, optic, or the suppressor this platform begs for.
What's in the box?
In the box is the complete SBR, one 30-round Cobalt Kinetics aluminum magazine, the RCB-6 muzzle device, and a manufacturer's certificate of compliance noting its NFA status. Unlike some competitors, it does not include a hard case, sling, or cleaning kit. The paperwork packet explicitly states the firearm is a 'Short-Barreled Rifle' as defined by 26 U.S.C. § 5845, a crucial detail for your FFL's acceptance.
Is the Cobalt Kinetics CK-PRO-LITE worth it at $2,034.99?
At $2,034.99, it's worth it for professionals or advanced enthusiasts who need a proven, suppressible SBR platform and value the factory-built NFA compliance over building from a Form 1 kit. You're paying for the certified SBR serialization, the ambidextrous controls milled into the receiver, and the Cobalt Kinetics gas system tuned for the short barrel. For a casual shooter wanting a compact 5.56, a 16-inch rifle like the Stevens 334 in a traditional caliber avoids the NFA entirely at less than half the cost.
Key attributes
| upc | 850060560217 |
| manufacturer | Cobalt Kinetics |
| manufacturer part number | CKPROLITE55675CKG |
| action | Semi-Auto |
| barrel length | 7.50" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 + 1 |
| safety | Ambidextrous Safety Lever |
Frequently asked questions
- Is it compatible with standard AR-15 parts?
- Yes, it uses a mil-spec lower receiver, so most AR-15 triggers, grips, and stocks will fit. The upper receiver has a proprietary low-profile gas block system, but the barrel nut accepts any M-LOK handguard with a standard anti-rotation tab. Buffer tube threads are 1 3/16-16, matching most commercial and mil-spec stocks.
- Does the muzzle device accept a suppressor?
- The included RCB-6 muzzle device accepts suppressors using the CGS and SilencerCo Omega mounting system. Direct-thread suppressors require removing the device, which exposes standard 1/2x28 threads. For a Dead Air KeyMo or SureFire SOCOM mount, you'll need to replace the factory device, a 10-minute gunsmithing job.
- How long does the NFA transfer take?
- Expect a 7 to 10 month wait for ATF Form 4 approval on an individual transfer, based on 2024 processing times. E-filed transfers through a gun trust may shave 1-2 months off. Your dealer, Ironclad Armory, initiates the paperwork once the firearm arrives at their SOT, a process that typically takes 3-5 business days from your order.
- Can I replace the barrel with a longer one?
- Legally yes, but you must notify the ATF in writing before permanently converting it to a title I rifle with a 16+ inch barrel. The factory barrel is secured with a proprietary gas block pinned at 12 o'clock; replacement requires a .750 journal diameter barrel and standard carbine-length gas tube. Swapping back to the 7.5-inch barrel requires another ATF notification.