SIG SAUER MCX Stock Adapter Kit Black. CAUTION: Many States and localities regulate the use and/or possession of collapsible and folding stocks. Use or possession of this product in conjunction with certain other parts may be illegal in some jurisdictions. It is YOUR responsibility to insure your use of this product is in compliance with all Federal State and local laws and regulations. Specifications for SIG SAUER MCX Stock Adapter Kit: Manufacturer: SIG SAUER Condition: New Color: Black Gun Model: SIG Sauer MCX Package Contents: SIG SAUER MCX Stock Adapter Kit SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER MCX Stock Adapter Kit is compatible with? The manufacturer says that SIG SAUER MCX Stock Adapter Kit is compatible with SIG Sauer MCXSIG SAUER 2401191-R: MCX Stock Adapter Kit Black