From The Manufacturer/Wikipedia/People Smarter Than Us:
As its name implies, the new RECCE-14 KMR ELW Mk2 features Bravo’s KeyMod Rail (KMR) handguard—free-floating for enhanced accuracy—a mid-length gas system and a 14.5-inch barrel with a 5.56mm NATO chamber and a 1-in-7-inch twist rate, which offers good accuracy with a wide variety of bullet weights.