The M400 X-series features a free-floating M-LOK handguard, Magpul SL-K 6-position telescoping stock, Sig Flat Match Grade trigger, 16″ Chrome Moly barrel, and a 7075 T-6 aluminum receiver with a black hardcoat anodized finish.
Sig Sauer RM400SDI16BP M400 X-Series 5.56x45mm NATO 16″ 30+1, Black, Magpul SL-K Stock, OEM Polymer Grip, Flat Match Trigger
