This thin, lightweight folding stock from SIG Sauer uses a 1913 type interface for attachment. It can be used on either the SIG Sauer MCX Carbine or SBR. The stock can also be used on the MPX submachine gun. It has a recoil pad and a hole for a QD sling swivel. The MCX/MPX are modular design firearms that can be adapted into the perfect weapon system for any mission scenario or environment.