#html-body [data-pb-style=BH9TOEU]{justify-content:center;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}#html-body [data-pb-style=BH9TOEU],#html-body [data-pb-style=PDDGX3Q]{border-style:none;border-width:1px;border-radius:0;margin:0;padding:0}Upgrade your M4/AR rifle or lower assembly with this complete, drop-in M400 upper assembly. This kit includes all the necessary components for a complete swap, including a two-stage match trigger as well as the popular TANGO-MSR LPVO 1-6X24 (SFP) riflescope. The free-floating handguard utilizes a new steel lockup design that significantly reduces handguard deflection by providing maximum rigidity and allows for accessories to be attached on all four sides with no effect on accuracy. The 2-Stage Matchlite Duo trigger provides an out-of-the-box crisp 4.5 - 6.5lb pull weight with a flat blade design for a precision feel. Together, this kit gives you the one-stop solution when it comes to taking your M4/AR to the next level. The M400 was developed with the input from the professional instructors at SIG SAUER Academy. Building upon their decades of experience and countless hours of instruction, we have developed the M400 to meet the highest standards of performance and reliability. INCLUDED ITEMS: (1) Complete 16" 5.56 NATO Upper Assembly (1) SIG 2-Stage Matchlite Duo Trigger (1) TANGO-MSR LPVO 1-6X24MM (SFP) 16" 5.56NATO M400 UPPER ASSEMBLY FEATURES INCLUDE: Black Anodized Finish 3-prong flash-hider accept our SLH & SLX suppressor systems. Dual Clamp Handguard Locking System for Reduced Deflection Low-Profile Gas Block with Mid-Length Gas System High-quality, premium barrel TANGO-MSR LVPO 1-6X24MM FEATURES: High-performance 6x optical system with low-dispersion glass Integrated thread-in throw leaver for quick magnification changes Illuminated MSR BDC-6 reticle with 11x brightness levels Lay flat flip-back lens covers included Dependable waterproof, shockproof, and fog-proof performance Includes ALPHA-MSR one-piece aluminum cantilever mount