SIG’s M400 SDI XSeries in Moss Green: 16″ CHF 1:7 barrel (1/2×28), mid-length direct-impingement gas, free-float M-LOK handguard, ambi controls, Matchlite Duo two-stage trigger and Magpul telescoping stock. SIG lists about 33.25–36.5″ OAL and about 7.0 lb. Ships with one 30-round polymer magazine. Optics-ready flat-top — no factory optic. Moss Green. Manufacturer part number: RM400-SDI-16B-MSGRN.
Key features
- 5.56 NATO; 30+1; one 30-rd polymer magazine
- 16″ CHF barrel; 1:7; mid-length DI
- ~33.25–36.5″ OAL; ~7.0 lb
- Moss Green Cerakote; M-LOK handguard
- Matchlite Duo two-stage trigger
- SDI X moss
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 X shipped to your local FFL. You pick at checkout. Questions? Call 405-265-8955.
