Sig Sauer MCX Spear-LT IR | .300 BLK | 9″ | PMCX-300B-9B-IR

The Sig Sauer MCX Spear-LT IR is an AR-style pistol configured for .300 AAC Blackout with a 9″ barrel and a folding pistol brace. It is built with a gas-piston operating system and an M-LOK handguard, and is finished in a Gen II NiR FDE Cerakote intended to reduce IR signature. The pistol is optics-ready on a Picatinny footprint; a compact low-power variable like a Vortex Viper PST Gen II 1-6×24 pairs well for both close and intermediate-range work and remains under $1,000. Typical applications include range training and short-to-intermediate suppressed shooting where .300 Blackout advantages are desired.

Product Specifications

• The manufacturer part number is PMCX-300B-9B-IR.
• The manufacturer is Sig Sauer.
• The model designation is MCX Spear-LT IR.
• The caliber is listed as .300 AAC Blackout.
• The barrel length is 9 inches.
• The action is Semi-Auto.
• The magazine capacity is 30 rounds.
• The product includes 1 x 30-round magazine.
• The handguard uses M-LOK attachment points.
• The firearm is optics-ready with a PICATINNY footprint.
• The operating system is a Gas Piston design.
• The barrel material is specified as cold hammer-forged carbon steel.
• The finish is Gen II NiR FDE Cerakote (Flat Dark Earth).
• The stock type is a folding pistol brace.
• The UPC is 798681699636.

Purpose-built as a compact, suppressor-capable AR pistol platform, the MCX Spear-LT IR focuses on controllability and modularity in a short-barrel package. Its M-LOK handguard and optics-ready receiver let you configure a practical range or mission setup without excess weight. The Gen II NiR Cerakote finish and SIG engineering prioritizes durability and service-life in corrosive or demanding environments.

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