SIG MCX Piston Assembly – 6.75″ Barrel | 300 Blackout
Not Yet Rated | Write the First Review SKU: 222-SIG-KIT-MCX-PISTON-6B-300
UPC: 799000000000
MFG#: KIT-MCX-PISTON-6B-300

SIG MCX Piston Assembly – 6.75″ Barrel | 300 Blackout

Factory-Built for Suppressor-Ready Precision in Compact Platforms

Optimize your SIG MCX 300 BLK rifle or pistol with the SIG MCX Piston Assembly for 6.75″ barrels—a factory-original replacement engineered specifically for short-barreled .300 AAC Blackout builds. Whether you're running suppressed or unsuppressed, this piston assembly is designed to provide reliable cycling, enhanced gas regulation, and superior wear resistance in ultra-compact setups.

Built to SIG Sauer’s rigorous standards, this piston kit is essential for maintaining the performance and reliability of any short-barrel MCX in 300 BLK—especially in suppressed environments where gas tuning is critical.

🔧 Key Features:

• ✅ Factory OEM Replacement – Made by SIG Sauer for 6.75″ barrel MCX rifles and pistols chambered in 300 Blackout.

• 💨 Optimized for Suppressed Use – Ensures proper cycling with subsonic or supersonic 300 BLK loads.

• 🔩 Durable Construction – High-temperature steel and precision machining for longevity in high-round-count firearms.

• 🎯 Direct Gas Piston System – Enhances reliability and reduces carbon fouling compared to direct impingement designs.

• ⚫ Black Finish – Matches factory aesthetics and resists wear from heat and carbon buildup.

Compatibility & Installation:

⚠️ Critical Safety & Installation Notice:

This piston assembly requires full upper disassembly and should only be installed by certified SIG Sauer armorers. Improper installation can result in firearm malfunction, serious injury, or death. Substituting parts from other piston systems is not supported and voids the factory warranty.