Ships with: Upper, Bolt Carrier Group, Charging Handle, Taper Cap. This is ONLY the upper assembly.

Features:

  • Hard coat anodized finish
  • Aluminum M-LOK handguard
  • Tapered bolt lug
  • Short-stroke piston system
  • Unique internal recoil system

    NFA DISCLAIMER/WARNING:Upper receiver does not meet the 16" minimum barrel length requirement, and requires registration and a tax stamp with the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) when assembled into a complete rifle. Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.





    Item# Description Availability Qty
    Break
    MSRP Price Choose Qty
    SIG WUAMCX-5B-300BBLK-TAP
    UPPER, SIGMCX, 300 BLK, 5.5 IN, RATTLER, BLK, SEMI, AL MLOK HG
    Out Of Stock / Not Available For Back Orders 1 $1,999.99 $1,549.00
    SIG WUAMCX-6B-300BBLK-TAP
    UPPER, SIGMCX, 300 BLK, 6.75IN, BLK, TAPERED LUG, MLOK
    Out Of Stock / Not Available For Back Orders 1 $1,899.00 $1,499.00
    SIG WUAMCX-9B-300BBLK-TAP
    UPPER, SIGMCX, 300 BLK, 9IN, BLK, TAPERED LUG, MLOK

    In Stock

    1 $1,999.00 $1,499.00