Sig Sauer: SIG MCX-Rattler, 300BLK, 5.5" - SBR

(No reviews yet) Write a Review

Rapid deployment, thin, agile, and precise. This is the MCX Rattler. Featuring a 5.5" PDW barrel, the MCX platform has never been more compact or accessible. Ready to go where-ever it's needed, the MCX Rattler has a thin, foldable stock for easy concealment and stowage. This gun was designed from the ground up to be as discrete as possible while retaining all the capabilities of the MCX. Free-floating M-LOK handguards matched with a PDW upper and a PDW Ultra Thin Folding Aluminum Stock, the MCX Rattler SBR is the ideal choice for fast-moving operators.


  • Caliber: 300 BLK
  • Barrel Length: 5.5"
  • Twist Rate: 1 – 5"
  • Thread: 5/8 in - 24
  • Gas System: Gas Piston
  • Weight: 5.7 lbs
  • Length: 23.5” 
Included in Box:
  • QD Sling
  • 1x 30-Round Magazine

This firearm is a regulated item by the National Firearms Act (NFA). Please check with your local and state municipalities for any further regulatory requirements. It is the buyer's responsibility to make sure they comply with all NFA rules and applicable laws.


  U.S. Government Export Restriction

This item is restricted for export by the State Department and Department of Commerce. Make sure that you are familiar with all applicable laws.  ITAR Information.


FFL Requirements & Magazine Restrictions

This item has to ship to an FFL. Please read the attached information. Shipping Rules & Magazine Restrictions.




300 Black Out
5.5 inch
Consent Preferences