Sig Sauer MCX Rattler PCB 5.56mm 5.5″ Barrel

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The MCX Rattler offers a compact package while using a centerfire rifle cartridge. Featuring a 5.5″ barrel, the MCX platform has never been more compact or accessible. The PCB features a folding pistol brace for stability and easy concealment.The Rattler was developed to be a discrete option while retaining the robust capabilities of the full-sized MCX.

Caliber 5.56 NATO
Capacity *30 Rounds
Barrel Length 5.5″
Operating System Gas Piston, Rotating Bolt
Forend Alloy M-LOK
Weight 5.1 lbs.
Overall Length 19.3″
Sights None
Trigger SIG Enhanced, 5.5 – 9 lbs. weight
Brace PCB,Side Folding
California Compliant No

* Magazine(s) are not included for Restricted States.

Important note about our photos
While we make every effort to ensure that our product photos are accurate, manufacturers occasionally change the design of components such as triggers, sights, or magazines without notice. Also, modifications to the firearm or component may be required in order to meet specific state compliance requirements. While we make every effort to accurately describe and illustrate the item you are going to receive, there may be visual differences on various components that do not affect functionality.

Federal law requires that you be 21 years of age or older to purchase a handgun, frame or receiver. To purchase a shotgun or rifle, you must be 18 years of age or older. 18 U.S.C. Section 922(b)(1).

As required by federal law, this item may only be shipped to a dealer with a valid Federal Firearms License. If you do not specify the name and shipping address of your dealer, your order will be delayed.


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