Will these stocks fit both the Sig MPX and Sig MCX?

Yes. All of the stocks listed are compatible with both the Sig MPX and Sig MCX, as they use the same 1913 rear rail interface.

Are these Sig MPX stocks legal for pistol builds?

Stocks may be used on pistols only if the firearm has been registered as an SBR under the NFA. For pistol builds, consider a brace or verify current ATF regulations.

What is the difference between the SL-K and Minimalist Plus stock?

The SL-K stock offers a more traditional carbine-style shoulder support, while the Minimalist Plus stock is ultra-light and compact for low-profile builds.

Does the folding mechanism require tools?

No. These stocks use a tool-free folding mechanism designed for fast deployment and storage without the need for wrenches or disassembly.

Sig MPX Stock – Folding, Minimalist & 1913 Mount Kits

**Sig Mcx/mpx Folding Stk Magpul Sl-k** $221.81

**Sig Mcx/mpx Minimalist Plus Stk Coy** $221.81

**MCX/MPX FOLDING MAGPUL SL-K STOCK AND ADAPTER** $253.88

**MCX/MPX Minimalist Locking Folding Stock** $221.81

**MCX/MPX Minimalist Plus Locking Folding Stock** $221.81

**Stock, Mcx, Mpx, Folding, Mil Spec Stock** $173.05

**Sig Mcx/mpx Flding/tlscping Stk Blk** $221.81

**MCX/MPX Stock Folding & Telescoping** $213.19

**MCX/MPX Stock Hinge Assembly - 1913 Interface** $93.31

**Taran Tactical Mpx Stock Adapter** $48.51

Sig MPX Stock – Folding, Minimalist & 1913 Mount Stock Options

Looking for the right Sig MPX stock to finish your pistol, SBR, or carbine build? Mounts Plus carries the most trusted lineup of MPX-compatible stocks and stock adapter kits — including options from Magpul, Sig Sauer, and Mission First Tactical, all designed to fit the 1913 rail interface standard used by the Sig MPX and MCX platforms.

Whether you're upgrading a factory configuration or building a custom PDW setup, our stocks combine durability, folding capability, lightweight materials, and fast install to give your MPX a tactical edge.

🛒 Top Sig MPX Stocks & Kits

Product Name	Type	Price
Sig MCX/MPX Folding Stock w/ Magpul SL-K	Folding / 1913 Adapter	$221.81
MCX/MPX Minimalist Plus Folding Stock – Coyote	Folding Minimalist	$221.81
Folding PCB Kit – MPX / MCX	Folding Brace/Stock Adapter	$173.05
MCX/MPX 1913 Stock Hinge Assembly	1913 Rail Hinge Adapter	$93.51
Mil-Spec Folding Stock Kit – MPX / MCX	Folding / Adjustable	$173.19

📦 All products are compatible with Sig MPX, Sig MCX, and any 1913 rail rear interface system.

✅ Why Choose Our Sig MPX Stock Kits?

🔩 1913 Rail Compatibility – Fits MPX, MCX, and other rear rail platforms
🔄 Folding Functionality – Tool-free fold & lock design for compact storage
🪶 Minimalist or Fully Adjustable Options – Choose the right profile for your build
🔧 Easy Installation – Drop-in ready for pistol or SBR builds
⚙️ Made by Trusted Brands – Sig Sauer, Magpul, and MFT components

🧠 Which Stock Is Right for Your MPX Build?

✔️ Want a Folding Stock with Full Adjustment?
→ Go with the Magpul SL-K Folding Kit or Minimalist Plus.

✔️ Looking for PDW-Style Compact Build?
→ Try the Folding PCB Kit or 1913 brace adapter setup.

✔️ Need a Heavy-Duty Hinge Assembly Only?
→ Use the 1913 Stock Hinge Assembly and add your preferred AR-style stock.

🛠️ Installation Overview

Confirm your MPX has a 1913 rear rail interface
Attach stock or hinge kit using included hardware
Torque to spec and test folding lock-up
Zero and verify alignment during live fire

🧰 Need tools? Shop gunsmithing tools here

📚 Frequently Asked Questions (FAQ)

Q: Will these stocks fit the Sig MCX as well?
A: Yes. All models listed here are compatible with both the MPX and MCX, as they share the 1913 rail rear interface.

Q: Can I use these stocks on a pistol build?
A: Yes, but only if you're following NFA regulations or using a brace where legally permitted.

Q: Are these stocks made by Sig Sauer?
A: Some are OEM Sig parts; others are from high-quality aftermarket brands like Magpul and MFT.

Q: What's the difference between Minimalist and SL-K stocks?
A: The Minimalist is ultra-light and sleek; the SL-K offers more support and adjustment range.

Sig MPX Stock – Folding, Minimalist & 1913 Mount Kits | Mounts Plus