Will this SIG MPX handguard fit Gen 1 and Gen 2 models?

Yes. These M-LOK handguards are compatible with both Gen 1 and Gen 2 SIG MPX receivers that use the factory barrel nut system.

Can I install this handguard without gunsmithing?

Yes. The handguard installs using the factory mounting system and includes all necessary hardware. No permanent modification is required.

Is this handguard free-float?

Yes. It is a free-float M-LOK handguard that avoids contact with the barrel for better accuracy and heat dissipation.

Will this fit the SIG MPX Copperhead or K models?

No. This handguard is not compatible with Copperhead or K models due to their short barrel and unique upper design.

SIG MPX Handguard – M-LOK 8.5”, 14”, 16” Rail Upgrades

Name: SIG MPX Handguard – 8.5" M-LOK Free-Float Rail
Brand: Mounts Plus
SKU: MPX-HG-8.5-ML
Price: 204.64 USD
Availability: InStock

**MPX Aluminum M-LOK Handguard** $204.66

SIG MPX Handguard – M-LOK Rails for Tactical & Competition Builds

Upgrade your SIG MPX with a lightweight, rugged M-LOK handguard that blends form, function, and tactical precision. At Mounts Plus, we carry the most sought-after SIG MPX handguards in multiple lengths — including 8.5”, 14”, and 16” — built for drop-in compatibility, free-float performance, and reliable heat dissipation.

Whether you’re building a compact SBR, full-size carbine, or PCC competition rig, these aluminum handguards are machined to withstand abuse, retain zero, and mount your favorite lights, grips, and lasers with ease.

🛒 Top SIG MPX Handguards Available

Product Name	Length	Finish	Price
MPX M-LOK Handguard – 8.5”	8.5"	Black	$204.64
MPX M-LOK Handguard – 14”	14"	Black	$204.64
MPX M-LOK Handguard – 16”	16"	Black	$204.64

📦 All models include mounting hardware and are compatible with SIG MPX Gen 1 & Gen 2 receivers using the factory barrel nut system.

✅ Why Choose Our SIG MPX Handguards?

🧱 6061-T6 Aluminum Construction – Rigid, lightweight, and anodized
🧲 M-LOK Slots at 3, 6, and 9 o’clock – Mount grips, lights, and rails anywhere
🛠️ Drop-In Fitment – No gunsmithing required for standard MPX receivers
🔥 Free-Float Design – Improves accuracy by reducing barrel contact
🔄 Modular Length Options – Choose the right rail for your application

📐 Which MPX Handguard Length Is Right for You?

🔹 8.5” MPX Handguard

Perfect for SBR builds, truck guns, or compact PCCs. Keeps weight down and clears short barrels.

🔹 14” MPX Handguard

Great balance of size and accessory space for duty or range use. Ideal for 14.5” pinned barrels.

🔹 16” MPX Handguard

Full-length protection and accessory space for 16” carbine-length builds. Matches standard MPX carbine barrels.

🔍 SIG MPX Handguard Compatibility

Our M-LOK handguards fit:

✅ SIG MPX Gen 1 and Gen 2
✅ SIG MPX SBR, PCC, and Carbine Models
❌ Not compatible with SIG MCX or aftermarket upper conversions

If you're unsure about fitment, contact our support team before purchase.

🛠️ Installation Notes

Retains use of factory barrel nut and upper receiver
Installs with included screws and clamps
Align top rail with upper for seamless optics mounting
Use thread locker and torque to spec for best retention

🧰 Need tools? Shop gunsmithing tools here

📚 Frequently Asked Questions (FAQ)

Q: Will this handguard fit my SIG MPX Copperhead or K model?
A: No. Copperhead models and K variants use a different short barrel upper not compatible with these handguards.

Q: Are these rails free-float or drop-in?
A: They are free-float M-LOK handguards that use the factory mounting interface with no modification required.

Q: Can I run a suppressor under these handguards?
A: The 14” and 16” models can accommodate slim suppressors, depending on barrel/suppressor profile.

Q: Are these MPX handguards compatible with MCX?
A: No. The MCX uses a different upper and mounting system. See MCX Handguards.