SIG SAUER M400-SENTRY 5.56X45 NATO SEMI-AUTO RIFLE WITH ROMEO5 GENII 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(TM) 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. Like other rifles in the series, the M400-SENTRY was developed based on the direct input of professional instructors at SIG SAUER Academy. Their decades of combined expe Mfg: Sig Sauer, Inc.