Sig Sauer RM400SDI16BP M400 X-Series 5.56x45mm 30+1 16″ Black FNC Chrome Moly Steel Barrel, Black Anodized Aluminum Receiver, 15″ M-LOK Handguard, Synthetic Magpul SL-K Stock, Black Polymer Grip

Overview

The Sig Sauer M400 SDI X-Series 5.56 NATO rifle features a 16-inch barrel and an upgraded M400 platform. The receiver is precision-machined with a lightning-cut design and a specialized handguard clamp system to minimize deflection. It comes equipped with fully ambidextrous controls, including a bolt catch and release, selector switch, charging handle, and magazine release. Additional features include a 2-Stage Matchlite trigger, a Magpul SL telescoping stock, and a hybrid flash hider/compensator. The rifle operates via a mid-length gas system with a low-profile gas block and includes a 30-round magazine.

Price & Stock History

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