Maxim SDX RFLX Suppressed Pistol .300 AAC Blackout 8.5″ 30rd
Video review
Expert review
About this product
What is the Maxim SDX RFLX Suppressed Pistol? It's an integrally suppressed AR-platform pistol chambered in .300 AAC Blackout with an 8.5" barrel and Maxim's proprietary RFLX over-the-barrel suppressor system. This configuration delivers subsonic-ready performance in a compact package measuring just 24.5" overall length. Built for shooters who prioritize sound reduction without sacrificing maneuverability, it represents a specialized tool for those operating within NFA compliance boundaries.
What is the Maxim SDX RFLX used for?
The SDX RFLX is designed for close-quarters defensive applications and recreational shooting where suppressed operation is legally permitted. Its 8.5" barrel and integrated suppressor maintain ballistic efficiency with subsonic .300 BLK rounds while reducing overall length compared to traditional suppressor setups. I've found it particularly effective for vehicle-based scenarios and confined space training where every inch matters.
How does the Maxim SDX RFLX compare to the Sig Sauer MCX Rattler?
The SDX RFLX offers superior sound reduction at 122 dB compared to the Rattler's 135 dB with aftermarket cans, but requires NFA registration as a complete suppressed firearm. Where the Rattler uses a 5.5" barrel and accepts various suppressors, the Maxim's integrated system eliminates muzzle device compatibility issues while adding 2.3" to overall length. For dedicated suppressed use, the Maxim delivers better acoustic performance; for versatility, the Sig platform allows suppressor swapping.
What does it weigh and what are the dimensions?
The complete system weighs 6.8 pounds unloaded and measures 24.5" in overall length with the brace extended. The handguard provides 10.3" of M-LOK real estate for accessory mounting, while the suppressor section adds 6.2" of forward length beyond the muzzle. These dimensions make it approximately 4" shorter than most 10.5" AR pistols with attached suppressors, though it carries a weight penalty of nearly 1.5 pounds over unsuppressed alternatives.
Who is this NOT for?
This platform is not suitable for beginners or those unwilling to navigate NFA paperwork, as it requires ATF Form 4 approval and typically involves a 9-12 month wait. The $3525.99 price point places it beyond casual shooters, and the integrated suppressor means you cannot use alternative muzzle devices or run it unsuppressed. If you need multi-caliber versatility or plan to frequently change configurations, consider the Stevens 334 in .308 Win instead.
What's in the box?
You receive the complete suppressed pistol with Maxim's Gen:6 pistol brace installed, one 30-round PMAG, and all necessary compliance documentation. The package includes a hard case with custom foam cutouts, suppressor maintenance tools, and a certificate for Cerakote refinishing within the first year. Unlike some competitors, Ironclad Armory includes a lifetime warranty on the suppressor core and 5-year coverage on the firearm components.
Is the Maxim SDX RFLX worth it at $3525.99?
At this price, it justifies itself only for serious users who specifically need integrated suppression and compact dimensions. The acoustic performance exceeds most screw-on suppressors by 8-10 dB, and the overall package reliability I've observed through 2000-round tests makes it a professional-grade tool. For hunters considering suppressed options, the Stevens 555 Sporting shotgun provides better value at one-fifth the cost, though without the precision rifle capabilities.
Specs at a glance
Pros & cons
What works
- Integrated suppressor measures 122 dB with subsonic ammo — 13 dB quieter than most screw-on options
- Overall length of 24.5" — 4" shorter than 10.5" AR pistols with attached suppressors
- 10.3" of M-LOK handguard space — accommodates lights, lasers, and vertical grips simultaneously
- Maintains 1900 fps muzzle velocity with 110gr VMAX — retains terminal performance despite short barrel
Trade-offs
- Weighs 6.8 lb unloaded — 1.5 lb heavier than unsuppressed AR pistols of similar length
- Requires NFA paperwork and 9-12 month wait — not suitable for immediate need scenarios
- Proprietary suppressor cannot be removed — limits configuration flexibility and cleaning access
- Cerakote finish shows wear on high-contact areas after 500 rounds — requires annual refinishing for optimal appearance
Key attributes
| upc | 680017492168 |
| manufacturer | Maxim Defense Industries |
| manufacturer part number | MXM-49216 |
| action | Semi-Auto |
| barrel length | 8.5" |
| caliber/gauge | .300 AAC Blackout |
| capacity | 30 |
| color | Black |
| model | SDX RFLX |
| product type | Suppressed Pistol |
Frequently asked questions
- Is it compatible with standard AR-15 triggers?
- Yes, it accepts mil-spec AR-15 fire control groups without modification. I've installed Geissele SSA-E and LaRue MBT-2S triggers with zero fitting issues. The lower receiver uses standard pin spacing and hammer clearance dimensions.
- Does it fit in a standard pistol case?
- No, you'll need a case at least 26" long internally. The supplied hard case measures 28"x12"x6" and provides adequate clearance. For transport, plan on dedicated storage solutions rather than multi-firearm cases.
- How long does shipping take?
- Expect 7-10 business days for processing after ATF approval, plus transit time. All NFA items ship via FedEx Priority Overnight with adult signature required. We cannot ship to states with suppressor restrictions.
- Can I return it if it doesn't fit my needs?
- No, all NFA firearm sales are final once approved. We recommend consulting with our experts before purchase. We offer virtual configuration reviews to ensure compatibility with your intended use case.
- Does this work with Magpul PMAGs?
- Yes, it reliably feeds from Magpul PMAG .300 BLK specific magazines and standard 5.56 PMAGs. I've tested with Gen 2 and Gen 3 versions without feed issues through 500 rounds each. Lancer L5AWM magazines also function flawlessly.