Sig Sauer MCX Spear SBR | 6.8x51mm | 13 in | 20+1

The Sig Sauer MCX Spear SBR is a 6.8x51mm short-barreled rifle built on the MCX platform with a 13 inch cold hammer-forged steel barrel and a folding Magpul SL-M stock. It features fully ambidextrous controls, a Sig two-stage Matchlite Duo trigger and an adjustable two-position gas system for reliable operation across a range of loads. The rifle ships with a single 20-round steel magazine and a SLH/SLX flash hider with 5/8×24 threads. For a capable optic under $1,000 that pairs well with the MCX Spear for close-to-mid range work, consider the Vortex Viper PST Gen II 1-6×24.

Typical applications include close-quarters carbine training and short- to mid-range precision/carbine shooting; the platform’s modularity also supports caliber conversion on compatible components for broader use in field and training contexts.

Product Specifications

• The action type is Semi-Auto.
• The cartridge is 6.8x51mm.
• The barrel length is 13 inches.
• The barrel material is Cold Hammer Forged Steel.
• The muzzle features a SLH/SLX suppressor flash hider with 5/8×24 threads.
• The rifle ships with 1 x 20-round steel magazine.
• The capacity is listed as 20 + 1.
• The trigger is a Sig Two-Stage Matchlite Duo.
• The stock is a Push-Button Folding Magpul SL-M design.
• The controls are Ambidextrous.
• The handguard uses an M-LOK accessory rail.
• The operating system is a Gas Piston with an adjustable 2-position gas valve.
• The finish is Coyote Anodized.
• The listed weight is 8.90 lbs (with magazine).
• The UPC is 798681701292.

Compact and purpose-built, the MCX Spear SBR brings the 6.8x51mm performance into a short-wheelbase platform without sacrificing the controls and modularity expected from the MCX line. Its combination of an adjustable gas system, ambidextrous features and a purpose-fit trigger makes it suitable for shooters who need a compact, service-oriented carbine in a modern sporting configuration. The coyote anodized finish and folding stock simplify handling and storage while retaining the accessory compatibility of an AR-style platform.

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