Firearms

SIG Sauer SIG MCX Spear 6.8x51mm 16-inch

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Specifications

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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

Civilian semi-automatic version of the US Army XM5 Next Generation Squad Weapon in 6.8x51mm hybrid case. 16-inch barrel, fully ambidextrous, folding stock. Uses SIG-proprietary hybrid steel-brass cartridge cases.

Type: Rifle

Action: Semi-Automatic

Caliber: 6.8x51mm

Capacity: 20

Year introduced: 2023, USA

Weight: 8.4 oz

Overall length: 35.5"

Status: Active

Intended use: Collector / Range / Military