Firearms

SIG Sauer MCX .300 BLK 9-inch

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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

SBR-length MCX in .300 BLK; NFA item optimized for suppressed use.

Type: Rifle

Action: Semi-Automatic

Caliber: .300 Blackout

Capacity: 30

Year introduced: 2015, USA

Weight: 5.9 oz

Overall length: 30"

Status: Active

Military use: Yes

Intended use: Tactical/Military