Caliber: 300 BLK. Complete integrally suppressed system that combines SDX508 platform with over-the-barrel M-Kore reflex suppressor. SBR has 8.5” barrel. RFLX suppressor delivers 129dB reduced sound levels. Maxim Defense SDX 2-piece M-LOK handguard, full-length Picatinny rail. Finishes, black and arid brown. Stock: Maxim Defense Gen:7 CQB or Magpul CTR. Introduced 2026. OAL: 32.25” to 34.75” Weight: 7 lbs. 13 oz.