The SIG Sauer MCX Spear-LT is a short-stroke piston rifle chambered in 5.56 NATO with a 16-inch barrel. It has a folding stock and fully ambidextrous controls.
The MCX Spear-LT is SIG Sauer's lightweight piston rifle, and this is the base 5.56 NATO rifle with a 16-inch barrel. It's part of the MCX family, which SIG builds around a short-stroke piston instead of direct impingement.
The barrel is cold hammer forged steel with a 1-in-7 twist and 1/2-28 threads with a tapered shoulder. It wears SIG's Rocksett QD suppressor-ready flash hider, so mounting a suppressor is straightforward. The gas system is adjustable, which helps when you switch between suppressed and unsuppressed shooting, and the barrels are interchangeable.
SIG gives the Spear-LT fully ambidextrous controls and keeps a forward assist, which some shooters still like to have. The handguard is a lightweight M-LOK design with a Picatinny top rail.
The stock is SIG's folding Minimalist Plus. The rifle measures 34.3 inches with the stock extended, 32.5 inches collapsed and just 26.5 inches folded, which makes it easy to store or carry in a smaller case. It weighs 7.4 pounds.
The trigger is SIG's two-stage Matchlite Duo with a flat profile. SIG includes one 30-round AR-15 compatible polymer magazine, the rifle ships in a hard case, and it's covered by SIG's Infinite Guarantee.
If you want a folding, piston-driven 5.56 with ambidextrous controls and a quick path to a suppressor, the MCX Spear-LT is a well-rounded modern rifle from a major maker.
Our team is available to answer questions about specifications, provenance, availability, and FFL transfer logistics. We typically respond within one business day.
We typically respond within one business day.
