The Sig Sauer M400 SDI-X in 5.56 NATO (brand part no. PM400-SDI-11B-BLK) is a semi-automatic pistol built around an 11.5-inch barrel finished in black FNC, wrapped in an M-LOK-compatible handguard. Sig Sauer threads the muzzle 1/2×28, cuts the barrel with a 1-in-7-inch twist, and equips the M400 SDI-X with a Magpul BSL brace, shipping it with a 30-round magazine and a thumb safety. Among AR-pattern pistols in the AR pistols category, the M400 SDI-X favors shooters who want a Sig-built 5.56 pistol with a Magpul brace already installed.
Key Specifications
- Chambered in 5.56 NATO.
- Operates as a semi-automatic pistol.
- Features an 11.5-inch barrel.
- Barrel is finished in black FNC.
- Uses a 1-in-7-inch rate of twist.
- Muzzle is threaded 1/2×28.
- Ships with a 30-round magazine included.
- Equipped with a Magpul BSL brace.
- Runs a thumb safety.
- Ships at approximately 9.55 pounds.
Frequently Asked Questions
What brace does this pistol ship with? A Magpul BSL brace.
Does this pistol include sights? No, it ships optic-ready with no fixed sights.
Buy the Sig Sauer M400 SDI-X Pistol
A Sig-built 5.56 pistol with a Magpul brace already installed is exactly what the M400 SDI-X delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.
