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:
| Feature | Detail |
|---|---|
| Model Compatibility | SIG MCX (All Generations) |
| Caliber | .300 AAC Blackout (300 BLK) |
| Barrel Length Fit | 9″ Barrel |
| Material | High-Strength Steel |
| Finish | Black |
| SKU | KIT-MCX-PISTON-9B-300 |
| Firearm Type | Semi-Auto Rifle or Pistol (MCX) |
⚠️ 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.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.
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