Sig Sauer

Sig Sauer MCX Rattler 5.5" Caliber Exchange Kit, 5.56 NATO, Tapered Lug

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MSRP:$699.99 $599.99
UPC 798681602803

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Genuine replacement barrel for the 5.5" 5.56 NATO Rattler. Complete with barrel and gas block assembly.


  • 1x 5.5" 5.56 NATO MCX Rattler Barrel
  • 1x Gas Valve Assembly & Piston Assembly (Installed)
  • 1x Tapered Lug Bolt

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

NOTE: It will not function with a factory .300BLK handguard. This barrel requires the 5.56 NATO Rattler handguard. 

SIG SAUER offers upper assemblies and caliber exchange kits in various barrel lengths. All NFA rules apply to the 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 that (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. As the buyer of these components, it is your responsibility to ensure you comply with all NFA rules and applicable laws.

Barrel Length: 5.5 Inches

Caliber/Gauge: 5.56 NATO

Model Fit: MCX

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