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Hi Richard, this has a 1913 endrail with QD sling socket. Firearm will accept most all 1913 side-folding & telescoping pistol brace and stock options. (A stock will require a tax stamp, it would make it a SBR) The Sig Sauer MCX/MPX Folding Pistol Brace will work, you can see it installed here >>> https://www.recoilweb.com/angstadt-arms-mdp-9-review-174926.html Stay safe & have a great day!

you want a pistol brace not a stock. a stock makes it a SBR and requires NFA paperwork and tax stamp Braces like the sig MCX/MPX Folding Pistol Brace will work https://www.budsgunshop.com/product_info.php/products_id/161092/sig+sauer+pivoting+contour+brace+for+mcx+mpx

Hi Richard and welcome. Folding Brace requires no NFA registration or $200 Tax Stamp. Folding Stock would require both. Recommended Folding Brace here: https://www.budsgunshop.com/product_info.php/products_id/110014/sb+tactical+specialty+brace+black+specialty+brace ------------ Cheers, stay safe and happy holidays!