The SIG SAUER MCX-SPEAR LT IR is a next-generation tactical rifle built for shooters who demand advanced modularity, combat-grade reliability, and modern battlefield performance. Chambered in 5.56 NATO and featuring a 16-inch cold hammer-forged barrel, this premium rifle incorporates SIG’s innovative Gen II IR FDE Cerakote finish, specifically engineered to reduce infrared signature while enhancing durability and corrosion resistance in harsh operational environments.
One of the defining features of the MCX-SPEAR LT IR is its highly adaptable Telescoping/Folding Stock. Designed with a push-button locking mechanism, the stock allows rapid adjustment for improved shooter fit and compact storage while maintaining exceptional stability during firing. The folding capability makes the rifle ideal for transport, vehicle deployment, and confined operational environments without sacrificing performance.
The rifle also features a SIG Suppressor-Ready QD Flash Hider, allowing shooters to quickly attach compatible SIG suppressors while effectively minimizing visible muzzle flash. Combined with the rifle’s short-stroke piston operating system, the suppressor-ready design enhances reliability, recoil management, and overall shooting performance in suppressed or unsuppressed configurations.
Another major advantage of the MCX-SPEAR LT platform is its exceptional modularity. The rifle offers full interchangeability with all MCX-LT barrels and handguards, allowing shooters to easily customize caliber configurations, barrel lengths, and rail systems to fit specific mission requirements or shooting preferences. This modular design makes the MCX-SPEAR LT one of the most adaptable rifle systems available today.
The MCX-SPEAR LT IR is also built with fully ambidextrous controls, including the safety selector, charging handle, magazine release, and bolt catch/release. This user-focused design provides seamless operation for both right- and left-handed shooters while improving efficiency during reloads, malfunction clearing, and weapon manipulation under stress.
Additional premium features include a SIG 2-Stage Matchlite Duo trigger with a crisp, clean break, an M-LOK/Picatinny compatible handguard for accessory mounting, a flat trigger shoe for enhanced trigger control, and a durable short-stroke piston operating system trusted by military and special operations forces around the world.
Key Features
Gen II IR FDE Cerakote finish
16" cold hammer-forged barrel
SIG Suppressor-Ready QD Flash Hider
Fully ambidextrous controls
Telescoping/Folding stock
Interchangeable MCX-LT barrel and handguard system
SIG 2-Stage Matchlite Duo trigger
Flat trigger shoe
Short-stroke gas piston operating system
M-LOK/Picatinny accessory rail
AR-compatible reduced angle grip
Suppressor-ready platform
Important Specs
Manufacturer: SIG SAUER
Model: MCX-SPEAR LT IR
UPC: 798681699698
SKU: RMCX-556N-16B-IR
Caliber: 5.56 NATO
Action: Semi-Automatic
Operating System: Short-Stroke Piston
Barrel Length: 16"
Barrel Material: Cold Hammer Forged Steel
Barrel Twist Rate: 1:7
Thread Pattern: 1/2x28 TPI Tapered Shoulder
Trigger Type: SIG 2-Stage Matchlite Duo
Trigger Shape: Flat
Trigger Pull: Approximately 4.5 lbs
Stock Type: Telescoping/Folding
Grip Type: AR-Compatible Reduced Angle
Handguard Type: Alloy
Rail System: M-LOK/Picatinny
Flash Hider: SIG Suppressor-Ready QD Flash Hider
Controls: Fully Ambidextrous
Magazine Type: AR-15
Magazine Included: (1) 30-Round Polymer Magazine
Finish: Gen II IR FDE Cerakote
Color: Flat Dark Earth (FDE)
Overall Length: 35.1"
Collapsed Length: 32.5"
Folded Length: 26.5"
Width: 2.7"
Height: 7.6"
Weight: 7.5 lbs
Forward Assist: Yes
Adjustable Gas System: Yes
Included In The Box:
SIG SAUER MCX-SPEAR LT IR Rifle
(1) 30-Round Polymer Magazine
Owner’s Manual
Cable Lock
