MCX is 11.5 in 556. It's a joy to shoot. That SB Tactical brace is fantastic.
Only have about 300 rounds through the XCompact. Not bad with it, but still need some practice. Bit more snappy than my other 9MM pistoles. Just got the ROMEO1PRO for the it. Won't get to shoot that until Tuesday.
edit: I do wish the EOTech had shake to wake. All my Romoes and Holosuns have it and it's been great.