Maxim Defense SDX RFLX
Maxim Defense Industries · Personal Defense Weapon · In Production · 2025
Overview
The Maxim Defense SDX RFLX is an integrally suppressed .300 Blackout AR pistol using Maxim's RFLX over-the-barrel reflex suppressor, which wraps rearward over the 8.5-inch barrel to keep overall length compact at roughly 30 to 35 inches depending on brace. The 10.1-inch suppressor reports 129 dB on subsonic and 134 dB on supersonic loads, and the gun ships with an ALG Combat trigger and a choice of Maxim's Gen 6 CQB brace or an SBA5 brace. Offered in Arid or Black finishes and built to order.
Specifications
| Weight (empty) | 3643 g (128.5 oz) |
| Overall Length | 863.6 mm (34.00") |
| Folded Length | 765.2 mm (30.13") |
| Barrel Length | 215.9 mm (8.50") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Rotating Bolt |
| Trigger Type | Single Stage |
| Magazine Capacity | 30 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 625 m/s (2051 fps) |
| Muzzle Energy | 1585 J (1169 ft·lbf) |
| Effective Range | 200 m (219 yd) |
| Barrel Rifling | Right Hand |
| Frame Material | Aluminum |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Type Iii Anodized |
Calibers
- .300 AAC Blackout · primary — also known as 300 BLK, 7.62x35mm
Features
- Firing modes: Semi Automatic
- Feed systems: Stanag Detachable Box Magazine
- Safety mechanisms: Manual Thumb Safety
- Features: Rflx Over The Barrel Suppressor, Gen6 Cqb Pistol Brace, Sba5 Brace Option, Alg Combat Trigger, Hk Height Rail, M Slot Handguard, Ambidextrous Controls, Ar15 Magazine Compatible, Hearing Safe
Variants
- SDX RFLX SBR — Nfa Sbr
Production
Production years: 2025-present
Origin
Country of origin: United States
Notes
MSRP $3,695. RFLX over-the-barrel (reflex) suppressor is 10.1" long. Sound: 129 dB subsonic / 134 dB supersonic. 4-6 week lead time.