The M400 SDI X-Series is SIG’s ambi-control duty carbine built with Academy instructor input. Ambidextrous bolt catch/release, selector and mag release sit under a free-float M-LOK handguard with a rigid clamp lockup. A flat Matchlite Duo trigger, hybrid flash hider/compensator and Magpul SL stock make it a ready range and defensive AR without a factory optic.
Key features
- 5.56 NATO; 16″ barrel, 1:7″ twist; 1/2×28 hybrid flash hider/compensator
- Free-float M-LOK handguard; dual-clamp lockup
- SIG Matchlite Duo 2-stage flat trigger
- Fully ambidextrous controls including bolt catch/release
- Magpul SL telescoping stock; about 7 lb; ~33.5″–36.75″ OAL
- Ships with one 30-round magazine; optic-ready (no sights)
Buying from PM Customs in Yukon
PM Customs is a licensed FFL in Yukon, OK, serving the Oklahoma City metro. Choose local pickup by appointment (generally Mon–Sat, 8 AM–4 PM), or have your M400 SDI shipped to your local FFL. You pick at checkout. Questions? Call 405-265-8955.
