MD:15 – PISTOL | 7.62×39
November 30, 2025
5.56 NATO – 70 GR. TUI SBA
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SDX RFLX – SBR
$3,695.00
SDX RFLX | SBR
Introducing the SDX RFLX SBR—a brand new evolution in integrally suppressed weapon systems from Maxim Defense. Chambered in .300 Blackout and built on the battle-proven SDX platform, the RFLX features our M-Kore™ reflex suppressor, a true over-the-barrel system that reduces added length while maximizing sound reduction and balance. With a tuned gas system and internal suppressor extension, the SDX RFLX delivers a stunningly quiet 129 dB at the shooter’s ear with subsonic ammo—making it one of the quietest compact .300 BLK rifles in its class.
The SBR configuration is available as CQB or carbine configurations, equipped with our Gen:7 CQB stock (CQB) or Magpul CTR Stock (caribine) ALG Combat trigger, and military-grade materials from muzzle to receiver. If you need maximum performance in minimum space, this is the next-gen PDW system built to dominate suppressed.
New, sleek, and insanely quiet, the SDX-RFLX has redefined suppressed AR platforms.
SDX508 Platform
| Caliber: |
.300BLK
|
| Barrel Length: |
8.5 inches
|
| Overall Collapsed Length : | CQB: 32.25 inches / CTR: 32.25 inches |
| Overall Extended Length : | CQB: 35.75 inches / SBA5: 34.75 inches |
| Weight: |
CQB: 8lbs .3oz / CTR: 7lbs 13oz
|
| Trigger: | ALG Combat |
| Stock/Brace Options: | Maxim Defense GEN:7 CQB Stock / Magpul CTR Stock |
| Finish: |
Type III Hard coat anodize
|
rflx suppressor
| Overall Length: |
10.1 inches
|
| Back Over Barrel Length: |
3.09 inches
|
| Length Added to Muzzel: | 6.9 inches |
| Outer Diameter: | 1.75 inches |
| Materials: | Titanium, 17-4SS |
| Finish: | DLC (Diamond-like Coating), Cerakot |
| DB at Left Ear: |
Subsonic: 129 dB – Supersonic: 134 dB
|
| Firing Schedule: | Full Auto Rated |
At Maxim Defense, we take pride in designing and manufacturing high-performance firearms, suppressors and accessories that deliver exceptional reliability and durability. Your feedback and positive reviews are important to us, as they help us continually improve our products. If you experience any issues with your Maxim Defense products, please contact us at info@maximdefense.com, and we’ll work with you to resolve the matter as quickly as possible. Please note that we do not cover damage caused by the installation of other manufacturers’ products.
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| Color | Arid, Black |
|---|---|
| Stock | GEN:7 QCB Stock, Magpul CTR Stock |
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