Sig Sauer MCX the MCX platform is also designed with modularity in mind, allowing for configuration flexibility and enhanced ergonomics compared to traditional AR-15 rifles. Chambered in 5.56 NATO, this MCX delivers excellent controllability, reduced recoil impulse, and strong reliability. This example is equipped with a folding stock, allowing for a more compact overall profile for storage, transport, or vehicle use while still maintaining full-length performance when deployed. Also includes a Surefire Warden fast attach blast regulator.