Sig Sauer M400 SDI Sentry, Semi-automatic Rifle, AR, 223 Remington/556NATO, 16 Threaded Barrel, Anodized Finish, Black, 30 Rounds, 1 Magazine, Includes ROMEO 5 Red Dot and Foxtrot MSR Light RM400-SDI-16B-R5FX The M400-SENTRY offers a ready-to-go solution for the most discerning shooters, combining the proven capabilities of the M400-SDI X platform with the multi-purpose functionality of the ROMEO5 GENII red dot, FOXTROT-MSR Full Size Light and a vertical foregrip. This combination of standardized features makes the M400-SENTRY an out-of-the-box solution for home/personal defense, advanced training or recreational shooting.