Firearms

SIG Sauer M400 DI

Specifications

About

Notable Variants

Aftermarket Ecosystem

Historically Significant Examples

Serial Number Data

Production data from factory records and collector research. Year ranges are approximate for pre-1968 firearms.

Years	Serial Range	Count	Factory	Country	Confidence

Updated M400 DI series; SIG-spec free-float rail, enhanced trigger, flat dark earth option.

Type: Rifle

Action: Semi-Automatic

Caliber: 5.56x45mm NATO

Capacity: 30

Year introduced: 2021, USA

Weight: 112 oz

Overall length: 32"

Status: Active

Intended use: General Purpose, Patrol