Sig Sauer M400 SDI, Semi-Auto Pistol, PM400SDI11BBLK, 5.56 NATO, 11.50″, BSL Brace, 30 Rds

SIG SAUER M400 SDI X-Series Semi-Auto Pistol – 5.56 NATO, 11.5″ Barrel, BSL Brace, Black Finish, 30-Round

The SIG SAUER M400 SDI X-Series PM400SDI11BBLK is a premium semi-automatic pistol chambered in 5.56 NATO, designed for shooters seeking a compact, high-performance AR-style platform with upgraded features from SIG SAUER’s SDI X-Series lineup. Featuring an 11.5-inch cold hammer forged barrel, Magpul BSL brace, and enhanced ergonomics, this pistol delivers excellent maneuverability while maintaining the reliability and accuracy expected from the M400 family.

The M400 SDI X-Series incorporates performance upgrades including a free-floating aluminum M-LOK handguard, flat match-grade trigger, and ambidextrous controls for improved handling. The direct gas impingement operating system provides a lightweight and proven design, while the compact barrel configuration offers a balance of portability and ballistic performance.

Finished in Black, this configuration includes a Magpul BSL pistol stabilizing brace, full-length Picatinny top rail, M-LOK accessory slots, and a 30-round magazine. The M400 SDI X-Series is built for users who want a compact rifle-caliber pistol platform with premium components and SIG SAUER craftsmanship.

Specifications

Key Features

• Chambered in 5.56 NATO
• Compact 11.5-inch barrel
• Premium M400 SDI X-Series configuration
• Magpul BSL pistol brace
• Flat match-grade trigger
• Cold hammer forged barrel
• Free-floating M-LOK handguard
• Full-length optics rail
• Ambidextrous controls
• AR-15 magazine compatibility
• 30-round magazine capacity
• Designed for compact handling and performance

The SIG SAUER M400 SDI X-Series 5.56 NATO Pistol combines the proven M400 platform with upgraded SDI components, offering a compact, reliable, and highly configurable firearm platform for shooters who want enhanced performance in a smaller package.