SIG Sauer M400 SDI X
SIG Sauer M400 SDI X 5.56 NATO 16in 30+1 Rifle
The SIG Sauer M400 SDI X is a direct-impingement, semi-automatic 5.56 NATO rifle built for high performance and ambidextrous operation. It features a 16 in chrome/moly steel barrel with a 1:7 twist rate, a free-float M-LOK handguard and a MIL-STD 1913 (Picatinny) top rail for mounting optics and accessories. The platform is fitted with fully ambidextrous controls and a multi-position telescoping buttstock.
Factory configurations ship with a single 30-round magazine and include SIG muzzle device(s). The M400 SDI X platform is described by SIG as a performance-oriented M400 variant suitable for professional/trainin…
