#html-body [data-pb-style=D0LM5KO]{justify-content:center;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}#html-body [data-pb-style=D0LM5KO],#html-body [data-pb-style=WY2LGE1]{border-style:none;border-width:1px;border-radius:0;margin:0;padding:0}Factory replacement hinge assembly for SIG MCX and MPX rifles with folding stocks. 1913 interface to attach to the back of the receiver. Includes screw to attached to stock stem. 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.