The SIG SAUER M400-SDI Sentry Rifle Package combines the M400-SDI X, ROMEO5 GenII Red Dot, FOXTROT-MSR Light, and vertical foregrip into one ready-to-shoot platform. Developed with input from the professional instructors at SIG SAUER Academy, the M400-SDI X AR-15 Semi-Auto Rifle delivers the highest level of performance and reliability. Featuring fully ambidextrous controls including a bolt catch and release the M400-SDI X is easy to operate for both right- and left-handed shooters. The free-floating M-LOK handguard features a new steel lockup design that reduces handguard deflection by providing maximum rigidity and allows for adding accessories on all 4 sides without negatively affecting accuracy. The 2-stage Matchlite Duo trigger delivers a 4.56.5 lb. pull weight with a flat blade while the stock provides enhanced cheek weld and easier shoulder transitions. Additional features include a mid-length gas system, barrel with SIG flash hider-compensator, and low-profile gas block. Adding to the performance capabilities of the M400 platform is the factory-installed ROMEO5 GenII Red Dot, FOXTROT-MSR Light, and vertical foregrip. With its crisp 1 MOA dot, the ROMEO5 provides over 40,000 hours of runtime thanks to SIG's motion-activated MOTAC design. Includes one 30-round magazine. Fully ambidextrous controls Free-floating M-LOK handguard with dual-clamp locking system Barrel has SIG flash hider-compensator 2-stage Matchlite Duo trigger with 4.56.5 lb. pull Mid-length gas system with low-profile gas block Includes ROMEO5 GenII Red Dot, FOXTROT-MSR Full-Size Light, and vertical foregrip