Sig Sauer RMCXR556N16B MCX Regulator 223 Rem/5.56 NATO 10+1 16" Black Nitride Muzzle Brake Barrel, GEN II NiR FDE Cerakote ARCA/Picatinny Rail Aluminum Receiver, Flat Dark Earth Synthetic Magpul SGA 590 Stock, Ambidextrous

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MCX Regulator
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The MCX-Regulator- using the heart and soul of the legendary MCX platform combined with a proprietary lower design, all built around shooter ergonomics. Featuring an aluminum frame; Magpul SGA Mossberg 500/590 traditional stock; lower receiver compatible with all MCX upper receivers; receiver finish in Reduced Weapons Visual-IR Signature GEN II NiR FDE Cerakote; fully ambidextrous magazine release, safety selector and bolt catch; two-stage match trigger; cold hammer-forged carbon steel barrel; SIG-designed muzzle brake and a built in ARCA Rail for easy tripod mounting. Includes 10rd polymer magazine.


  • Action: Semi-Auto
  • Caliber: 223 Rem/5.56 NATO
  • Barrel Length: 16"
  • Capacity: 10+1
  • Trigger: Two-Stage Match
  • Safety: ARCA/M-LOK
  • OAL: 39.10"
  • Weight: 8 lbs
  • Stock Description: Magpul SGA 590
  • Muzzle: Sig 2-Port Muzzle Brake
  • Receiver Material: Aluminum
  • Sights: None
  • Barrel Description: Muzzle Brake
  • Twist: 1:7"
  • Barrel Length Range: 16" to 16.99"
  • Weight Range: 8 lbs to 8.99 lbs
  • Hand: Ambidextrous
  • Stock Finish Group: Brown
  • Metal Finish Group: Brown
  • Manufacturer Part Number: RMCXR556N16B
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