If you bought that off of a retailer's web site, it more than likely demonstrates that SIG is issuing a brand new SKU selection (outdated SKU is discontinued) to accommodate a alter. The MPX K is available in black and tan and its receivers are made of plane quality aluminum. https://sig-sauer-firearms-for-sa85183.blogolize.com/indicators-on-sig-sauer-mpx-k-for-sale-you-should-know-61159135