Maxim Defense SDX RFLX SBR | .300 BLK | 8.5 in

The Maxim Defense SDX RFLX SBR is an integrally suppressed short-barreled rifle built on the SDX platform and chambered in .300 AAC Blackout. It combines a tuned gas system with Maxim’s M-Kore reflex suppressor to reduce added length while improving balance and sound reduction; the manufacturer reports 129 dB at the shooter’s ear with subsonic ammunition. For optics, a compact reflex like the Leupold DeltaPoint Pro pairs well with the SDX RFLX for fast target acquisition without exceeding a $1,000 equipment budget.

Product Specifications

• The manufacturer is Maxim Defense Industries.
• The model is listed as SDX RFLX.
• The rifle is chambered in .300 AAC Blackout.
• The barrel measures 8.5 inches for compact handling.
• The action is Semi-Auto.
• The stated capacity is 30 rounds.
• The finish is specified as Cerakote.
• The external color is Black.
• The grip material is Polymer.
• The stock type is listed as Maxim Defense.
• The product type is SBR and the subcategory is Short-Barreled Rifles.
• The design incorporates Maxim’s M-Kore reflex suppressor as an over-the-barrel integral system.
• The manufacturer reports a sound level of 129 dB at the shooter’s ear with subsonic ammunition.
• The product is described with a CQB configuration and full-length Picatinny rail for optics and accessories.
• The UPC is 680017492199.

The SDX RFLX is optimized for compact, quiet performance at short ranges. It is appropriate for close-quarters shooting and suppressed-range training where reduced report and compact handling are priorities. Its full-length rail and robust SDX chassis make it a capable platform for mounting optics and accessory controls while maintaining a compact footprint.