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Sig built the MCX to be modular, and this adapter is the piece that unlocks the folding stock side of the platform. It bolts onto the rear Picatinny interface of your MCX and gives you a solid mounting point for genuine MCX folding stock assemblies. If you have been running a fixed setup and want the compact footprint that a folder brings for storage, transport, or a shorter overall length, this is the factory way to get there without hunting down aftermarket workarounds.
The adapter interfaces with the 1913 Picatinny rail section at the rear of the receiver, which is how Sig designed the MCX to accept different rear-end configurations. Once it's mounted, you can attach a compatible MCX folding stock and get that fold-to-the-side capability the platform is known for. It's worth knowing up front that this kit is built specifically for folding stock assemblies. It won't work with collapsible stocks or brace setups, so make sure the stock you're pairing it with is a true folder before you order.
Sig went with machined aluminum here, finished in matte black to match the rest of the rifle. It runs light, right around three ounces, so you're adding the folding capability without loading down the back of the gun. Because it's a factory Sig part rather than a third-party clone, fitment on the MCX receiver is dialed in the way you'd expect, and the black finish blends in cleanly with the anodized hardware already on your rifle.
The MCX has always been a platform people love to configure and reconfigure, and adding folding stock capability is one of the bigger quality-of-life upgrades you can make. Whether you're building out a truck gun, a travel setup, or just want the option to collapse the overall length for a case, this adapter is the foundation that makes it happen. Pair it with the MCX folding stock of your choice and you're set.
It gives you a mounting point on the rear Picatinny interface of your Sig MCX so you can install a genuine MCX folding stock assembly. This adds the fold-to-the-side capability the platform is known for, which is handy for storage, transport, and reducing overall length. It's the factory route to converting a fixed setup into a folder.
No. This kit is designed specifically for MCX folding stock assemblies and will not work with collapsible stocks or brace setups. Make sure the stock you plan to run is a true folding stock before pairing it with this adapter.
This particular kit is set up for the MCX platform and mounts to the receiver's 1913 Picatinny interface. Sig does make related folding stock adapters that reference both MCX and MPX, so if you're running an MPX, double-check that your stock and adapter combination is matched for that receiver. When in doubt, confirm your exact model before ordering.
Yes, this is a factory Sig Sauer component, part number 2401191R. Because it's built by Sig for the MCX rather than a third-party clone, fitment on the receiver is dialed in and the black finish matches the rest of the rifle's hardware.
| UPC | 798681581207 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 2401191R |
| Color | Black |
| Model | |
| Package Height | 1.3 |
| Package Width | 4.0 |
| Product Type | Accessory-Stocks |
| Shipping Weight | 0.2 |
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