Sig Sauer M400 .223 REM/5.56 NATO

The Sig Sauer M400 SDI is an AR-style pistol built to deliver reliable, consistent performance on the range and in training. Chambered for .223 REM/5.56 NATO, the M400 SDI is configured as a compact platform with features aimed at controllability and accessory compatibility.

Designed with ambidextrous controls and a rigid free-floating handguard, this pistol offers familiar AR ergonomics in a shorter package suited to close-range work and range sessions. The overall configuration balances maneuverability with the modularity needed for optics and accessories.

The build combines a cold hammer-forged chrome-moly barrel and an anodized aluminum receiver with polymer furniture for a durable, lightweight feel. The Magpul BSL telescoping brace and folding brace-compatible grip support a variety of shooting positions while the hybrid compensator/flash hider and 1/2×28 tpi threaded muzzle allow for common muzzle accessories.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• The barrel length is 11.5 inches.
• The barrel is made of Chrome Moly Steel with a Black FNC finish.
• The rate of twist is 1:7.
• The action is Semi-Auto.
• The magazine capacity is 30 rounds.
• The handguard is a free-floating M-LOK handguard.
• The trigger is a 2-stage flat blade match.
• The stock type is a Magpul BSL telescoping brace.
• The weight with magazine is 5.80 lbs.

Buy the Sig Sauer M400 .223 REM/5.56 NATO online today to add a compact, feature-rich AR-style pistol to your inventory for range work and training. The M400 SDI combines modern ergonomics and accessory-ready design for straightforward setup and use.

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