Sig Sauer PMCX556N11BIR10 MCX Spear LT 5.56 NATO 10rd 11.50"

The Sig Sauer MCX Spear LT is a 5.56 NATO semi-automatic rifle built for shooters who need serious capability in a compact, lightweight platform. At 11.5 inches, the barrel delivers velocity and handling that work equally well for defensive, tactical, or competitive applications. The MCX Spear LT IR features Sig's Gen II Cerakote in FDE—a thermal-reducing finish that keeps you concealed under night vision and thermal optics while resisting wear and corrosion in field use.

This rifle is built on Sig's gas piston system and cold hammer-forged barrel, engineered for reliability under demanding conditions. The flat-blade match trigger breaks cleanly, and the fully ambidextrous controls let you shoot and reload smoothly whether you're right- or left-handed. The tele-fold stock compresses to 26.25 inches, making it easy to stow in a vehicle, backpack, or tight shooting position without sacrificing your sight picture or ergonomics when deployed. At 6.68 pounds loaded, it stays light enough for all-day carry.

The 1/2-inch-28 threads accept standard suppressors, and the SIG QD flash hider gets you running quiet fast. M-LOK handguard gives you modular accessory mounting, while the adjustable gas system lets you fine-tune performance for different ammunition or suppressor loads. The rifle ships with one 10-round AR-15 compatible polymer magazine and accepts standard AR platform magazines. Interchangeable barrels mean you can reconfigure caliber or length down the road if your mission changes.

Built for the kind of shooters who understand that compactness, reliability, and precision aren't mutually exclusive, the MCX Spear LT IR is a purpose-built tool that performs.

Key Features

• Gen II IR Cerakote FDE finish for reduced thermal signature and corrosion resistance
• Cold hammer-forged 5.56 NATO barrel, 1:7 twist, suppressor-ready 1/2-28 threads
• Gas piston operating system with adjustable gas block for reliability and tuning
• Fully ambidextrous controls and SIG flat-blade match trigger
• Tele-fold stock design: 29.75" extended, 26.25" folded
• M-LOK compatible handguard for modular accessory mounting
• Interchangeable barrel capability for future reconfiguration
• Forward assist for manual chamber confirmation
• Lightweight at 6.68 lbs with magazine

Specifications

Frequently Asked Questions

What magazines work with the MCX Spear LT?

The MCX Spear LT accepts standard AR-15 compatible magazines. One 10-round polymer magazine is included with the rifle.

Can I attach a suppressor to this rifle?

Yes. The barrel is threaded 1/2 inch-28 tpi and ships with a SIG quick-detach flash hider, ready for standard suppressors rated for 5.56 NATO.

What's the advantage of the fold stock?

The tele-fold stock compresses the rifle from 29.75 inches to 26.25 inches when folded, making it significantly easier to transport, store, or deploy from tight spaces like a vehicle or pack, while remaining fully functional when extended.

Can I change barrels on the MCX Spear LT?

Yes, the MCX platform supports interchangeable barrels, so you can reconfigure to a different caliber or barrel length in the future if your needs change.