SIG’s M400-SDI X pistol: 11.5″ cold-hammer-forged barrel (1/2×28), free-float M-LOK handguard, XSeries controls, optic-ready upper (no optic included) and Magpul BSL telescoping pistol stabilizing brace. SIG lists about 30.1″ OAL (about 28.2″ collapsed) and about 5.8 lb. Ships with one 30-round magazine. Magpul BSL brace IS included; no factory optic. Manufacturer part number: PM400-SDI-11B-BLK.
Key features
- 5.56 NATO / .223 Rem; 30+1; one 30-rd magazine
- 11.5″ CHF barrel (1/2×28); ~30.1″ OAL
- ~5.8 lb (SIG); Magpul BSL brace included
- Optic-ready upper (no optic included)
- M-LOK free-float handguard
- XSeries controls
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.
