SIG MCX Piston Assembly – 9″ Barrel | 300 Blackout (300 BLK)
Not Yet Rated | Write the First Review SKU: 222-SIG-KIT-MCX-PISTON-9B-300
UPC: 799000000000
MFG#: KIT-MCX-PISTON-9B-300

SIG MCX Piston Assembly – 9″ Barrel | 300 Blackout (300 BLK)

Suppressor-Optimized. Short-Barrel Ready. Factory-Certified Performance.

Maintain peak reliability and suppressed performance with the SIG MCX Piston Assembly for 9″ barrels chambered in 300 Blackout (300 BLK). Designed as a direct factory replacement, this OEM part ensures that your SIG MCX rifle or pistol cycles cleanly and consistently—especially in suppressed and short-barrel configurations.

Whether you're replacing a worn part or tuning your system for optimal gas regulation, this 9″ piston assembly is essential for shooters who demand maximum performance from their suppressed or compact MCX build.

🔧 Key Features:

• ✅ Factory OEM Part – Built to SIG Sauer’s strict specifications for exact fit and function.

• 🎯 Designed for 9″ Barrels – Precision-engineered for MCX platforms in .300 AAC Blackout with 9” configurations.

• 🔇 Suppressor-Friendly Design – Enhances cycling performance with subsonic or supersonic ammo, suppressed or unsuppressed.

• 💪 Durable Construction – Machined from high-strength steel and finished in black for heat resistance and longevity.

• 🔁 Piston-Driven Reliability – Cleaner, cooler operation than direct impingement systems, especially in high-round-count or suppressed setups.

What’s Included:

• Complete Piston Assembly for SIG MCX with 9" .300 BLK barrels

Technical Specifications:

⚠️ Installation Warning:

This component requires disassembly beyond standard field-stripping and should only be installed by a certified SIG Sauer armorer. Improper installation can result in malfunction, serious injury, or death. Do not substitute any parts—this piston assembly must be installed as a complete, factory unit.