Sig Sauer MCX/MPX Folding Adapter, Low Profile Tube, 1913 Interface.
Machined from quality aluminum with a steel mounting clamp, this folding stock adapter is designed for the Sig Sauer MPX and MCX platform firearms. This adapter uses a 1913 attachment interface and allows for a traditional M4 stock to slide onto the low-profile buffer tube. This unique design saves weight and reduces unnecessary bulk.