Can I convert my Sig MCX to another caliber?

Yes. Sig MCX Caliber Exchange Kits allow you to switch between 5.56 NATO, .300 Blackout, and 7.62x39. Each kit includes the barrel, gas block, and bolt.

What’s the most popular Sig rifle accessory upgrade?

Triggers, folding stocks, and suppressor-ready handguards are among the most popular upgrades for Sig MCX and MPX rifles.

Sig Rifle Accessories – MCX, MPX, 556 Parts & Upgrades

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.

SIG 556

SIG MPX Accessories

Sig MCX Accessories

**Samson Manufacturing STAR SIG 5.56 Patrol Handguard Rail** $332.07

**Samson STAR SIG 5.56 Handguard Rail** $321.96

**Samson Quick Flip Sig 5.56 Sight Set (Front & Rear Package)** $190.81

**TriggerTech SIG MPX Two Stage Adaptable Trigger – Flat** $294.99

**TriggerTech SIG MPX Two Stage Adaptable Trigger – Curved** $294.99

**MCX/MPX Minimalist Plus Locking Folding Stock** $226.58

**MCX/MPX Minimalist Locking Folding Stock** $226.58

**Sig Mcx/mpx Minimalist Plus Stk Coy** $226.58

**Arisaka Ofst Sct Mount Galil/mpx M-lok** $52.28

**Radian Raptor Charging Handle Mpx Blk** $104.95

**TriggerTech SIG MCX Adaptable Trigger – Flat** $294.99

**TriggerTech SIG MCX Adaptable Trigger – Curved** $294.99

**Sig Sauer MCX-SPEAR LT 5.56 16" Tactical Rifle (Barrel Only)** $788.28

**MCX-SPEAR LT 300BLK 10 INCH HANDGUARD** $448.27

**Radian Raptor Charging Handle Mcx Blk** $104.95

**KNS Compact AR/MCX Stock Adapter** $67.22

**KNS AR/MCX Stock Adapter Without Flange** $67.22

**KNS AR/MCX Stock Adapter WITH Flange** $67.22

**Arisaka Side Scout Mount Mcx M-lok** $52.28

**Arisaka Ofst Scout Mount Mcx M-lok Fde** $58.28

**Arisaka Offset Scout Mount Mcx M-lok** $52.28

🔧 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
Charging Handles & Controls	All	Ergonomics & ambi control
Mounts & Optics	All	Sight systems, red dots

🔥 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

📋 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.

Find AR-15 Accessories That Match Your Rifle Setup

Choosing the right AR upgrade starts with fitment, compatibility, and a clear understanding of your rifle configuration. Mounts Plus offers AR-15 accessories for shoppers comparing compatible stocks, grips, handguards, rails, optic mounts, sling hardware, tools, upper parts, lower controls, and other trusted AR-platform parts.

Compare each product by receiver fitment, rail type, mounting style, material, finish, included hardware, brand, and manufacturer compatibility notes. Whether you are replacing worn parts, completing a build, or selecting upgrades for an existing rifle, clear product details help you choose with confidence.

Browse Mounts Plus for AR-15 accessory options selected for practical compatibility, dependable construction, and straightforward parts comparison. Always confirm platform fitment, product compatibility, and applicable local requirements before ordering.