This stock or brace adapter allows you to use your favorite AR-15 carbine adjustable stock or brace on your MCX or MPX. Features a 5-position Mil-Spec sized low profile Carbine-style receiver extension tube. Attaches to your MCX or MPX vertical Picatinny section. - Color : Black - Material: 7075-T6 Aluminum - Length:    7 in - Weight:    5.8 oz - Gun Model: SIG MCX, SIG MCX-SPEAR, SIG MCX-SPEAR LT, SIG MPX

The stock at the picture is for display purposes only, and not included with this folding receiver extension tube selling.