Sig Sauer MCX SPEAR LT Firearms
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SIG Sauer MCX-SPEAR LT Rifle, 7.62×39, 16″ Barrel, FDE, 28-Round
$2,599.99 -
SIG Sauer MCX Rattler LT PCB Pistol, 300 BLK, 6.75-Inch Barrel, Black, 30-Round
$2,499.99 -
SIG Sauer MCX-SPEAR LT IR 5.56 NATO Pistol, 11.5″ Barrel, FDE, 30-Round
$2,499.99 -
SIG Sauer MCX-SPEAR LT IR 300 BLK Pistol, 9″ Barrel, FDE, 30-Round
$2,499.99 -
SIG Sauer MCX Rattler LT SBR, 5.56 NATO, 7.75-Inch Barrel, Black, 30-Round
$2,499.99 -
SIG Sauer MCX-SPEAR LT Rifle, 5.56 NATO, 16-Inch Barrel, Black, 30-Round
$2,599.99 -
SIG Sauer MCX Rattler LT SBR, 300 BLK, 6.75-Inch Barrel, Black, 30-Round
$2,499.99
SIG MCX SPEAR LT Firearms
The SIG SPEAR LT is SIG’s lighter folding MCX. The MCX is the piston rifle SIG has been refining for years: a short-stroke system that does not need a buffer tube, a fold, and fully ambidextrous controls. SPEAR LT lightens the handguard so it stays quick in the hands. You get an adjustable gas valve and SIG’s flat-blade match trigger. The top rail is optic-ready. A factory optic is not installed. SIG fits a QD flash hider meant for SIG SLX and SLH suppressors; that is not a claim that every can mounts.
The 16 in. rifles are the full-length folding carbines: black 5.56 with a 30-round magazine, and coyote 7.62×39 with a 28-round magazine. The 9 in. 300 BLK IR and 11.5 in. 5.56 IR are pistols with a folding PCB and SIG’s reduced-IR FDE coat. The shortest guns listed here are Rattler LTs, the compact MCX: a 6.75 in. 300 BLK pistol, a 6.75 in. 300 BLK SBR, and a 7.75 in. 5.56 SBR. Compare those in the SIG MCX Rattler collection.
How to choose
Every SPEAR LT here uses the same short-stroke piston, adjustable gas, and flat-blade match trigger. Pistols ship with a folding PCB. SBRs use a stock and need the NFA transfer. A factory optic is not installed. SIG’s QD flash hider is built for SIG SLX and SLH mounts, not every suppressor. These are serialized firearms and ship to a licensed FFL. See also SIG MCX firearms and SIG Sauer rifles.
Frequently Asked Questions
What is a SIG MCX SPEAR LT?
The MCX-SPEAR LT is SIG’s lighter folding MCX: a short-stroke piston gun with a lightened handguard, fully ambidextrous controls, and a folding stock or PCB. Civilian SPEAR LT barrels here are 9 in. in 300 BLK, 11.5 in. in 5.56 NATO, and 16 in. on the rifles.
What is the difference between SPEAR LT and Rattler LT?
Rattler LT is the compact MCX, with 6.75 in. barrels in 300 BLK and 7.75 in. in 5.56. SPEAR LT is the lighter full-size MCX, with 9 in., 11.5 in., and 16 in. barrels. The shortest guns on this page are Rattler LTs.
Is the SPEAR LT the same as the MCX-SPEAR in 6.8?
No. The MCX-SPEAR / M7 is the larger 6.8×51 family. SPEAR LT is the 5.56 NATO, 300 BLK, and 7.62×39 MCX with a lighter handguard and barrel.
Are these pistols, rifles, or SBRs?
The 16 in. guns are rifles with folding stocks. The 9 in. and 11.5 in. IR models are pistols with folding PCBs. The 6.75 in. and 7.75 in. Rattler LT SBRs are NFA short-barreled rifles and need a Class III transfer.
What magazines does the SPEAR LT use?
5.56 NATO and 300 BLK guns take AR-15 magazines and ship with a 30-round polymer magazine here. The 7.62×39 SPEAR LT ships with a 28-round magazine. Confirm local magazine capacity rules before you order.
Are SPEAR LT firearms suppressor-ready?
SIG fits a QD flash hider meant for SIG SLX and SLH mounts, and the gas valve is adjustable. That is not a claim that every suppressor fits. Confirm the muzzle device on the exact product page.
Do I need an FFL to buy a SPEAR LT?
Yes. Rifles and pistols ship to a licensed FFL. SBR models also need the NFA transfer and approval.