Sig MCX Parts – OEM Replacement & Upgrade Kits

Name: Sig Sauer MCX Piston Assembly (J02)
Brand: Sig Sauer
SKU: MCX-PISTON-J02
Price: 35.35 USD
Availability: InStock

Sig MCX Piston Assembly

**SIG MCX Take Down Pins & Springs** $33.29

**Sig Sauer MCX Upper Receiver Assembly, Gen2, Semi Auto – Gray** $455.71

**Sig Sauer MCX Semi Auto Selector Kit** $33.29

**SIG MCX Piston Assembly – 9″ Barrel | 300 Blackout (300 BLK)** $132.35

**SIG MCX Piston Assembly – 6.75″ Barrel | 300 Blackout** $132.35

**Sig MCX Virtus Piston Assembly – 16″ Barrel | 5.56 NATO** $132.35

**SIG MCX Piston Assembly – 5.5″ Barrel | 300 Blackout** $132.35

**SIG SAUER Factory MCX Virtus Piston Assembly – 16″ Barrel | 300 Blackout** $132.35

**Sig MCX Virtus Piston Assembly – 14″ Barrel | 5.56 NATO** $132.35

**Sig Sauer MCX Piston (J02) Assembly – 11.5″ Barrel | 5.56 NATO** $132.35

**OPERATING SPRINGS ASSY, RODS, SPRINGS, P** $93.31

**HANDGUARD LINK, SUPPRESSOR COMPATIBLE, S** $28.66

**GRIP, MCX, RATTLER PDW, SCREW, BLK** $36.75

**CHARGING HANDLE ASSY, AMBI, SMALL LATCHE** $93.31

Sig MCX Parts – OEM & Upgrade Components for Every Build

🛠️ Precision Parts for Your Sig Sauer MCX

Whether you're repairing, upgrading, or building a custom rifle, our collection of Sig MCX parts includes only the most reliable OEM and high-performance components. From small pins to upper receiver assemblies, every part is built to meet the demands of tactical professionals, competitors, and enthusiasts alike.

🔩 Why Choose Genuine Sig MCX Parts?

Sig MCX rifles are known for their modularity and reliability. Our parts help you:

🧰 Repair worn or broken components with original factory replacements
🔧 Upgrade your MCX with ambidextrous controls, improved ergonomics, or enhanced recoil management
🧱 Customize your build for home defense, SBR setups, or suppressed use

These parts are compatible with MCX Virtus, Rattler, and Legacy MCX models.

🧭 Sig MCX Parts Compatibility Guide

Model	Compatible Parts	Notes
MCX Virtus	Uppers, charging handles, pins, springs	Most parts are shared across Virtus models
MCX Rattler	Grips, selectors, PDW-specific stock parts	Short barrel platform may have unique gas needs
Legacy MCX	Limited part compatibility	Check product descriptions for fitment info

Always consult your manual or firearm tech if unsure which generation you own.

🔧 Top Sig MCX Parts Available

Product	Purpose	Price
Sig MCX Ambi Charging Handle	Smooth ambidextrous operation	$93.08
Sig Sauer MCX Piston Assembly (J02)	Maintain proper gas cycling	$35.35
Sig MCX Take Down Pins & Springs Kit	Secure upper/lower interface	$33.29
Sig MCX Selector Kit	Replace or upgrade fire control selector	$33.35
Sig MCX Rattler PDW Grip	OEM grip with enhanced texture	$36.29

💡 MCX Parts Buyer’s Guide

H3: Should I Use OEM or Aftermarket?
We recommend OEM parts for reliability and fitment. Use aftermarket options for ergonomic or visual upgrades (e.g., charging handles, stocks).

H3: What Tools Are Needed?
Most MCX parts can be installed with basic tools (Torx drivers, punches, and thread locker). Always verify torque specs from Sig.

H3: Legal Considerations
Make sure any modification complies with ATF guidelines, especially for SBR or suppressor-ready setups.

❓ Frequently Asked Questions (FAQ)

What parts fit the Sig MCX Rattler?

Most lower parts are shared across MCX platforms, but Rattler-specific components include the gas system, barrel, and PDW brace interface.

Are MCX Virtus parts compatible with the original MCX?

Some parts are cross-compatible, but upper receivers and barrels are not. Always check compatibility notes.

Can I install MCX parts myself?

Yes. Many components are drop-in ready. Basic tools and attention to detail are all most users need.

🚚 Why Buy from Mounts Plus?

✅ Genuine OEM & Premium Upgrade Parts
✅ Fast U.S. Shipping & Easy Returns
✅ Expert Support from Tactical Gear Pros
✅ Trusted by Military, Law Enforcement & Civilians

⚡ Build Your MCX. Your Way.

Whether you're repairing your rifle, upgrading to ambidextrous controls, or building a suppressor-ready setup, Mounts Plus has the Sig MCX parts you need to get the job done — and done right.