Sig Sauer MCX 5.56mm NATO Carbine with Folding Stock


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The SIG MCX is an innovative weapon system built around a battle-proven core: SIG’s gas-operated, short-stroke piston system. Trust it for the outstanding performance, no matter the conditions, that you’ve come to expect from the leading name in firearms.

Even while in the field, you can configure the SIG MCX as needs or conditions change. The combination of the 13” monolithic upper receiver and handguard create a 17 3/4” continuous top rail. The upper is backwards compatible with any mil-spec AR lower, allowing you to upgrade your existing AR platform to the SIG MCX.

The SIG MCX stands as the first rifle built to be silenced from the ground up. It also accepts a broad array of accessories, enabling you to build a complete weapon system for any scenario or environment. The SIG MCX eclipses everything that has come before it.


  • 3-Prong Flash Hider
  • Active Self-Regulating Gas System
  • Flip-Up Front and Rear Sights
  • M1913 Picatinny Monolithic Top Rail
  • Ambidextrous Magazine Release
  • 30-Round Magazine

Firearm Specifications

  • Item Number: RMCX-16B-TFSAL-P
  • Caliber: 5.56mm NATO
  • Action: Semi-Auto
  • Operating System: Gas Piston Rotating Bolt
  • Stock Type: Folding
  • Forend Type: Alloy KeyMod
  • Weight w/o Magazine: 6 lbs.
  • Overall Length: 35.75”
  • Barrel Length: 16”
  • Rifling: 1:7”
  • Trigger Type: MIL-SPEC
  • Trigger Weight: 6.6-8.6 lbs.
  • Magazine Capacity: 30 Rounds

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