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Jose, this depends on the back piece. Some are just round and a brace cannot be added and some have the bottom slot to add a brace. Example of round back piece : https://www.budsgunshop.com/product_info.php/products_id/141150/diamondback+db1912k001+db15+ar+pistol+carbine+length+5.56x45mm+nato+7+30+1+black+buffer+tube+stock and Slotted back piece with folding adapter : https://www.wingtactical.com/firearm-parts/ar-15-parts/buffer-buffer-tubes/buffer-tubes/midwest-industries-side-folding-stock-adapter-with-mil-spec-tube/

As mentioned already, it's possible you may need an adapter. Good Luck!!