Sig Sauer MCX SPEAR-LT 5.56 NATO 16″ Folding Stock
About this product
The Sig Sauer MCX SPEAR-LT is a modular, lightweight evolution of the MCX platform designed for versatile field use. Chambered for 5.56 NATO with a 16″ cold hammer-forged barrel, the SPEAR-LT pairs a folding Minimalist Plus stock and fully ambidextrous controls for convenient carry and handling. The rifle uses a gas-piston operating system, features an optic-ready upper and an M-LOK handguard for accessory mounting. A factory QD-compatible flash hider supports suppressor-ready setups when compliant accessories are used.
Key Specifications
- The rifle is chambered in 5.56 NATO.
- The barrel measures 16 inches.
- The action is Semi-Auto.
- The barrel material is cold hammer-forged carbon steel.
- The operating system is a gas piston.
- The twist rate is 1:7.
- The trigger is a Flat Blade Match design.
- The accessory interface is M-LOK on the handguard.
- The muzzle is threaded 1/2″-28 tpi for accessories.
- The listed weight is 7.5 lb.
Built for modularity and real-world utility, the MCX SPEAR-LT blends modern ergonomics with proven engineering. Its folding stock and ambidextrous controls make it practical for compact carry and rapid transitions, while the cold hammer-forged barrel, match-style trigger and gas-piston system support consistent performance. Whether prioritizing a lightweight, configurable platform for range work or a compact system for transportable use, the SPEAR-LT delivers rigid construction and feature-forward design.
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Specs at a glance
Key attributes
| upc | 798681683321 |
| manufacturer | SIG SAUER |
| manufacturer part number | RMCX-556N-16B-LT-B |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 16'' |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 |
| color | Black |
| length | 35.1'' |
| magazine included | 1 x 30-Round |
| model | MCX |
| number of magazines | 1 30 rd. |
| package height | 4.5 |
| package width | 11.5 |
| product type | AR |
| shipping weight | 10.4 |
| sights | No |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |