The Sig Sauer MCX Spear‑LT IR is a compact semi‑automatic AR‑pattern pistol built for tactical, range, and personal defense roles where a short, maneuverable platform is required. It pairs an 11.5″ cold hammer‑forged barrel with Sig’s gas‑piston operating system and a folding pistol brace for compact transport and storage. The Gen II NiR FDE (Coyote) Cerakote provides a reduced IR signature finish and corrosion resistance for field use.

Key Specifications

• The caliber is 5.56 NATO (.223 Rem), suitable for standard 5.56 NATO ammunition types listed by the manufacturer.
• The barrel measures 11.5 inches and is made from cold hammer‑forged carbon steel for durability.
• The weapon uses a semi‑automatic action and a gas‑piston operating system for reduced fouling and reliable cycling.
• The handguard features an M‑LOK accessory rail on an alloy fore-end for modular accessory mounting.
• The pistol ships with a threaded 1/2″‑28 tpi muzzle and a factory flash hider that is suppressor‑ready with Sig Rocksett® QD devices.
• The stock is a folding pistol brace (PCB) for improved compactness when stowed and rapid deployment when extended.
• The firearm includes (1) 30‑round polymer magazine and uses standard AR‑15 style magazines.
• Reported weight values conflict in the product data; reported values conflict — see notes for details.

State and shipping restrictions: this model ships with a 30‑round magazine and is subject to magazine capacity and shipping restrictions in several jurisdictions. Where 10‑round magazine limits apply (Hawaii, California, Connecticut, District of Columbia, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, Washington, and Colorado), possession or shipment of the included magazine may be restricted. The source metadata also indicates no direct ship to California, Rhode Island, or Washington and no sale to Illinois (PICA). Buyers should confirm local laws before purchase.

The MCX Spear‑LT IR emphasizes modularity and low observability with interchangeable barrels, ambidextrous controls, and a reduced IR signature finish. Its combination of a piston system, match‑style flat blade trigger, and ergonomics make it a practical choice for shooters who need a compact, serviceable platform for range work and defensive contexts.