My Cart: 0 item(s)
Sig Rifle Accessories – MCX, MPX, 556 Parts & Upgrades | MSP
Sig Rifle Accessories – Upgrade Your Sig MCX, MPX, and 556
Premium Accessories for All Sig Sauer Rifle Platforms
Enhance your Sig Sauer rifle with precision-engineered accessories built for performance and reliability. Whether you run a Sig MCX, MPX, 556, or SPEAR LT, Mounts Plus offers factory OEM and battle-tested aftermarket accessories to build, upgrade, or maintain your rifle platform.
🔧 Top Sig Rifle Platforms We Support
-
Sig MCX – Modular battle rifle with upgradeable barrels, stocks & gas systems
-
Sig MPX – 9mm PCC built for speed and suppression
-
Sig 556 – Classic Swiss-style semi-auto with folding stock options
-
Sig SPEAR LT – New-gen tactical rifle with ambidextrous controls
🔎 Shop by Accessory Category
| Accessory Type | Compatible Rifles | Use Cases |
|---|---|---|
| Triggers | MCX, MPX | Precision, competition |
| Stocks & Braces | MCX, MPX, 556 | Folding, telescoping, PDW |
| Handguards | MCX, SPEAR LT | Suppressor-ready, M-LOK |
| Barrels & Kits | MCX | Caliber conversion |
| Uppers & Carriers | MPX, MCX | Build kits, spares |
🔥 Featured Sig Rifle Accessories
| Product | Rifle | Description | Price |
|---|---|---|---|
| MCX Flat Trigger (TriggerTech) | MCX | Drop-in precision trigger | $279.99 |
| MPX Ambi Charging Handle | MPX | Smooth bilateral control | $93.08 |
| Folding PCB Stock | MCX / MPX | Compact, durable brace | $173.05 |
| MCX Caliber Conversion Kit – 300 BLK | MCX | Barrel, bolt, gas kit | $776.05 |
| 556 Sight Set – Front & Rear | SIG 556 | Steel, adjustable | $190.64 |
🧩 Compatibility Tips for Sig Accessories
-
MCX Virtus & SPEAR LT require Gen2/Gen3 parts
-
MPX barrels and bolts are unique to the 9mm platform
-
556 series uses specific trigger and stock geometry
-
Use caliber kits to convert your MCX to .300 BLK or 5.56 NATO
Need help choosing the right accessory? Contact our firearm experts →
📋 Why Upgrade Your Sig Rifle?
-
🎯 Improve accuracy and trigger response
-
🔁 Change caliber for training or defense
-
🔧 Customize ergonomics to your mission profile
-
💪 Replace worn or hard-to-find OEM components
-
🔦 Add lights, optics, and rail accessories via M-LOK or Picatinny
❓ Sig Rifle Accessories – Frequently Asked Questions
Q: Are MCX and MPX accessories interchangeable?
No — each platform has its own dimensions and gas system. Always choose accessories designed for your specific Sig model.
Q: What’s the most popular upgrade for Sig rifles?
Drop-in triggers, folding stocks, and suppressor-ready handguards are among the most common upgrades.
Q: Can I convert my Sig MCX to a new caliber?
Yes. MCX Caliber Exchange Kits allow for conversion between 5.56 NATO, .300 BLK, and 7.62x39.
⭐ Why Mounts Plus?
-
✅ Trusted supplier since 1993
-
✅ Factory OEM and high-performance aftermarket gear
-
✅ Fast U.S. shipping and easy returns
-
✅ Firearm experts available for product advice
🚀 Ready to Customize Your Sig Rifle?
From complete MCX builds to simple trigger upgrades, Mounts Plus carries the Sig rifle accessories trusted by professionals, competitors, and responsible citizens alike.