MCX Rattler 5.5″ Replacement Barrel – 300BLK


Factory replacement 5.5″ barrel for the MCX Rattler

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Genuine replacement barrel for the 5.5″ 300BLK Rattler. Complete with barrel and gas block assembly..


*Please Note

This Barrel is compatible with the Rattler ONLY. This barrel is not compatible with the MCX Virtus or Legacy MCX Uppers.

This product DOES NOT include a muzzle device 

SIG SAUER offers upper assemblies and caliber exchange kits in various barrel lengths. All NFA rules apply to installation of these upper assemblies to lower receivers and caliber exchange kits to upper receivers. Upper assemblies and caliber exchange kits with barrel lengths less than 16 “may only be affixed to lower receivers which (1) are not recorded as a rifle lower by the manufacturer and do not have a stock attached to the lower receiver or (2) registered with the BATFE as a short barreled rifle (SBR).

Please check with your local and state municipalities for any further regulatory requirements. It is your responsibility as the buyer of these components to make sure you comply with all NFA rules and applicable laws.


Caliber 300 Blk


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