Description
SIG Sauer MCX-Rattler LT 5.56 NATO Pistol, 7.75" Barrel, Black, 30-Round
The SIG Rattler LT 5.56 is the compact MCX. Same short-stroke piston and fully ambidextrous MCX controls, built around a much shorter barrel so the gun stays small without becoming a different platform.
The 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. These firearms ship to a licensed FFL.
This configuration
That 7.75 in. barrel is Rattler LT length. The 11.5 in. 5.56 SPEAR LT pistol is the longer compact option. This Rattler stays a pistol with a folding PCB, not a stock. The rail is optic-ready. A factory optic is not installed. SIG fits a QD flash hider meant for SIG SLX and SLH cans. SIG’s folding PCB ships on this pistol. This pistol ships to a licensed FFL. A factory SBR with a stock is a different firearm and a different transfer.
What ships
A factory optic is installed only when this page says so. This item ships to a licensed FFL. See the SIG MCX Rattler collection.
Specifications and Included Items
- Model: PMCX-556N-7B-LT-PCB
- Series: MCX-Rattler LT
- Configuration: Pistol with folding SIG PCB brace; not an SBR
- Caliber: 5.56 NATO
- Barrel: 7.75 in. cold-hammer-forged
- Twist rate: 1:7
- Operating system: Short-stroke piston; adjustable gas
- Muzzle: SIG QD suppressor-ready flash hider for compatible SLX/SLH suppressors; suppressor not included
- Receiver: Black anodized aluminum
- Handguard: Aluminum M-LOK
- Rail: M1913 top rail; optic-ready; iron sights not included
- Trigger: SIG Flat Blade Match
- Grip: PDW
- Controls: Fully ambidextrous, including bolt catch and release
- Magazine: One 30-round polymer magazine, AR-15 pattern
- Included accessories: Folding SIG PCB brace; one 30-round polymer magazine; cable lock; owner’s manual
- Transfer: FFL required








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