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Sig MCX Piston Assembly – Gen2 OEM Gas System Part

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SIG MCX Piston Assembly – 5.5″ Barrel | 300 Blackout
SIG MCX Piston Assembly – 5.5″ Barrel | 300 Blackout $132.35
SIG MCX Piston Assembly – 6.75″ Barrel | 300 Blackout
SIG MCX Piston Assembly – 6.75″ Barrel | 300 Blackout $132.35
SIG MCX Piston Assembly – 9″ Barrel | 300 Blackout (300 BLK)
SIG MCX Piston Assembly – 9″ Barrel | 300 Blackout (300 BLK) $132.35
Sig MCX Virtus Piston Assembly – 16″ Barrel | 5.56 NATO
Sig MCX Virtus Piston Assembly – 16″ Barrel | 5.56 NATO $132.35
SIG SAUER Factory MCX Virtus Piston Assembly – 16″ Barrel | 300 Blackout
SIG SAUER Factory MCX Virtus Piston Assembly – 16″ Barrel | 300 Blackout $132.35
Sig MCX Virtus Piston Assembly – 14″ Barrel | 5.56 NATO
Sig MCX Virtus Piston Assembly – 14″ Barrel | 5.56 NATO $132.35

 

Sig MCX Piston Assembly – OEM Gen2 Replacement for MCX Rifles

🛠️ Maintain Gas Performance & Reliability

The Sig MCX piston assembly is a critical part of the MCX’s short-stroke gas system. Whether you're maintaining your rifle or building a new upper, this OEM piston ensures consistent cycling, proper gas pressure, and long-term durability across a wide range of shooting conditions.

🔧 Compatible With:

  • ✅ Sig MCX Virtus – 11", 13", and 16" barrel configurations

  • ✅ Sig MCX Rattler – Suppressed and unsuppressed setups

  • ⚠️ Not compatible with original/legacy MCX (Gen1 systems)

Always confirm whether your upper uses the Gen2 piston system before ordering.

🔍 Product Details

  • Factory OEM Sig Sauer piston

  • Machined to precise specs for drop-in fit

  • Designed for semi-auto MCX Gen2 platforms

  • Black finish with durable coating

  • Improves cycling, especially under heavy use or suppressed fire

📦 Included: 1x Sig MCX piston assembly (J02 Gen2 model)
📌 SKU: MCX-PISTON-J02

🧠 Why Replace Your MCX Piston Assembly?

Over time, piston assemblies experience carbon buildup, erosion, or damage from high-volume or suppressed shooting. Replacing it helps:

  • Restore optimal gas function

  • Eliminate failures to cycle or eject

  • Prevent wear on surrounding components

  • Prepare your rifle for high-demand use (duty, SBR, or competition)

📋 Technical Specs

Attribute Detail
Compatibility MCX Virtus & Rattler (Gen2)
Material Steel
Finish Black Nitride
Install Type Drop-in, no gunsmithing
Use OEM replacement or upgrade

🔄 Installation Tips

  • Use gloves and degreaser to clean the old piston area

  • Apply anti-seize or lube if shooting suppressed

  • Inspect your gas block and recoil springs for carbon buildup

  • Torque everything to Sig specs

🛠️ Need help? Contact our gunsmith support team →

❓ Frequently Asked Questions

Q: Will this fit my MCX Rattler pistol?
Yes, as long as you’re using a Gen2 system. Most Rattlers use Gen2 parts, but verify your piston length and gas block style.

Q: Can I install this myself?
Absolutely. This piston is a drop-in component. No special tools or modifications required.

Q: Is this a genuine Sig Sauer part?
Yes — this is a factory OEM component, not aftermarket.

💬 Customer Reviews

⭐⭐⭐⭐⭐
"Solved my gas cycling issues immediately. Easy install and runs flawless on my Rattler with suppressor." – Jason W.

⭐⭐⭐⭐⭐
"Hard to find part, glad MSP had it. OEM Sig piston, exact fit. No problems at all." – Eric R.

🚀 Upgrade or Repair Your MCX with Confidence

Whether you’re running a suppressed SBR or need to restore reliability after heavy use, this Sig MCX Piston Assembly is the part you can trust. Mounts Plus carries it in stock and ships fast.