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Questions & Answers
Can this Stock be put on a AR pistol and not have to have the Tax Stamp involved or would it be considered an SBR?

No - you can't put a stock on a pistol. You need to find a something marketed as a brace.

by Casey, Verified Owner, July 27, 2021
Will this stock attach to a picaatinny rail? Expert Answer

Yes, this SIG SAUER MCX/MPX Folding Stock is designed to attach to a 1913/picatinny interface.

by Ethan, Gear Expert, September 28, 2023
Customer Reviews
Helpful Positive Review Awesome stock! by Cletus the Gunner, Verified Owner, July 18, 2021
This is a great stock, both in form and function. But, it is very, very small. It's extremely short, and I highly recommend some type of reduced angle grip it you plan of using this (like a BCM gunfighter, Magpul K2 or Ergo 0° grip). The width (where...
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6/6 found this helpful
Helpful Positive Review Great mpx/mcx modification. by Jordan, Verified Owner, July 18, 2018
Awesome product as always from Sig Sauer. Easy install and great fit, nice and light weight especially when trying to limit additional weight with any set up. I would definitely recommend this for any mpx/mcx owner.
2/3 found this helpful
Helpful Positive Review Folding Sig Stock by Amac, Verified Owner, July 25, 2018
Excellent stock and better looking and more compact than the original skeleton stock. Highly recommended. Included folding mechanism and 1913 adapter. Same stock that comes on Rattler SBR. Stock is the one in the second picture not the telescoping an...
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4/4 found this helpful
Helpful Positive Review Compact stock for your Sig rifles by DangerMouse, Verified Owner, September 14, 2018
This is the stock seen on the Rattler SBR and SURG. It's very compact and extremely lightweight. If that's what you want, then I would recommend this option. Cheek weld isn't optimal, but this is more for CQB than precision marksmanship.
3/5 found this helpful
Helpful Positive Review Fantastic quality stock by Bjaouni, November 21, 2019
The stock is amazing. It’s very tight at first and opens with a lot of effort but requires you to oil it and actuate it 30-40 times before it feels smooth and opens like it should. Fantastic product and opticsplanet said it would take up to 6 weeks t...
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3/3 found this helpful
Helpful Positive Review Great Item, Great service by Daimyo, Verified Owner, October 11, 2021
This is a rugged short stock that fits the 1913 Pic Rail. It IS a little heavy, expecially if using on a polymer framed firearm. The item was in stock as indicated and shipping was VERY fast from Optics Planet.
3/4 found this helpful
Read All 30 Reviews
Gun Model: SIG Sauer MCX , SIG Sauer MPX Color: Black Length: 8.5 inWeight: 11 ozAdditional Features: Butt-pad width 0.7in , Overall height 3.5in Condition: Factory DEMO Height: 3.5 inWidth: 0.7 in

Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-DEMO

MPN: STOCK-X-FOLD-MINI-BLK-DEMO

Product No Longer Available

Product Info for SIG SAUER MCX/MPX Folding Stock

The SIG SAUER MCX/MPX Folding Stock is a factory-quality addition to your firearm that assists with recoil control and folds in so that you can simply store and transport it without having to remove the stock. These Rifle Stocks designed by the experts at SIG SAUER easily installs on your receiver's 1913/Picatinny interface. Each MCX/MPX Folding Stock is outfitted with a 0.7in wide butt-pad that provides a more comfortable shooting experience for the range while you shoulder your weapon to mitigate recoil. Equip a SIG SAUER MCX/MPX Folding Stock to boost your accuracy without adding bulky attachments to your gun.image

Features of SIG SAUER MCX/MPX Folding Stock:

  • Installs easily on your MCX/MPX via the receiver's 1913/Picatinny interface
  • 0.7in butt-pad

Package Contents:

  • SIG SAUER MCX/MPX Folding Stock

5.56x45mm NATO Ammo

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Gun Parts and Accessories

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Firearm Case

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Forends/Handguards

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Gun Triggers

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.300 AAC Blackout Ammo

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Ammunition

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SIG SAUER MCX/MPX Folding Stock Unavailable & Discontinued Models

List of Unorderable Models

DEMO, SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK , MPN: STOCK-X-FOLD-MINI-BLK-DEMO , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-DEMO
USED, SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK , MPN: STOCK-X-FOLD-MINI-BLK-EDEMO , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-EDEMO-RE-A
USED, SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK , MPN: STOCK-X-FOLD-MINI-BLK-EDEMO , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-EDEMO-US-D
USED SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK, EDEMO16, Used, Condition Fair , MPN: STOCK-X-FOLD-MINI-BLK-EDEMO16 , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-EDEMO16
USED SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK, EDEMO10, Used, Condition Fair , MPN: STOCK-X-FOLD-MINI-BLK-EDEMO10 , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-EDEMO10
SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK , MPN: STOCK-X-FOLD-MINI-BLK , UPC: 798681583676 , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK
USED SIG SAUER Stock for MCX/MPX, Folding, Minimalist, Black, Large, STOCK-X-FOLD-MINI-BLK, EDEMO14, Used, Condition Like New , MPN: STOCK-X-FOLD-MINI-BLK-EDEMO14 , Code: SD9-RSF-MXF-STOCK-X-FOLD-MINI-BLK-EDEMO14
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