The Sig Sauer MCX Rattler LT (Sig part no. PMCX-300B-6B-LT-PCB) is designed to meet the needs of special operations forces, chambered in .300 Blackout with an ultra-compact 6.75-inch cold hammer-forged barrel. Fully ambidextrous controls, including an ambidextrous bolt catch and bolt release, keep the manual of arms fast from either shoulder. An adjustable gas piston lets you tune the system for suppressed or unsuppressed use, and the pistol ships fitted with the Sig QD suppressor-ready flash hider along with a flat-blade trigger for precise control. Fully compatible with all MCX barrels and handguards, this Sig Sauer pistol is finished in black manganese phosphate for a durable, low-maintenance exterior.

Key Specifications

• Chambered in .300 AAC Blackout, a versatile cartridge equally effective supersonic or subsonic.
• Runs an ultra-compact 6.75-inch cold hammer-forged barrel for maximum maneuverability.
• Holds 30 rounds per magazine, and ships with 1 magazine included.
• Uses a 1:5 twist rate tuned to stabilize a wide range of .300 Blackout bullet weights.
• Features an adjustable gas piston for tuning between suppressed and unsuppressed use.
• Ships fitted with the Sig QD suppressor-ready flash hider for quick suppressor attachment.
• Runs a flat-blade trigger for precise, consistent control.
• Features fully ambidextrous controls, including an ambidextrous bolt catch and release.
• Equipped with a thumb safety for familiar, deliberate manual operation.
• Weighs approximately 5.8 pounds unloaded, keeping the package light and maneuverable.

Frequently Asked Questions

Can the gas system be adjusted for a suppressor? Yes, the adjustable gas piston lets you tune the system between suppressed and unsuppressed use.

Is this pistol suppressor-ready? Yes, it ships fitted with the Sig QD suppressor-ready flash hider.

Is the MCX Rattler compatible with other MCX parts? Yes, it’s fully compatible with all MCX barrels and handguards.

Buy the Sig Sauer MCX Rattler LT Pistol, .300 Blackout, 6.75-Inch, PCB

The MCX Rattler LT was built to meet special operations requirements, and that same engineering is available to civilian shooters who want a genuinely compact, suppressor-ready .300 Blackout pistol. Order it from our AR pistols lineup at our Lubbock, Texas gun shop for fast, insured shipping to your FFL.