Sig Sauer MCX Upper Receiver Assembly


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MSRP: $1,695.99 | Our Price: $1,599.89 | Contact to order.


Product Overview

This is a special order product & lead times may be minimally affected. Contact or submit a request on our Contact Us page to order. We'll confirm your order immediately & place the order for you with the manufacturer.


Government Export Restriction(s):

  • This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.

Government Restriction(s):

  • By adding to cart, I understand and agree to the Domestic Compliance Policy and certify that I will comply with applicable federal, state and local laws and regulations.


This Sig Sauer Sig MCX Upper Receiver Assembly, M-LOK is a complete upper assembly kit built to improve your weapon's function. These AR15 Upper Receivers crafted by Sig Sauer convert any MIL-SPEC AR Lower into an MCX Rattler with ease. Each Sig Sauer Sig MCX Upper Receiver Assembly - 5.5in 300BLK includes an upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckler and a match duo trigger kit. Complete or upgrade your weapon build with this high quality Sig Sauer Sig MCX Rattler Upper Receiver Assembly.



  • Color: Black
  • Caliber: .300 AAC Blackout
  • Barrel Length: 5.5 in
  • Gun Rail: M-LOK
  • Gun Make: SIG Sauer
  • Gun Model: SIG Sauer MCX


WARNING: California Prop 65


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