Hi Jose, you cannot install a stock on your pistol, or it will become a short barrelled rifle. You need to install a pistol brace.
To install a brace on the Century International Arms BFT47, you need to remove the existing rear end cap and replace it with a compatible brace adapter.
For a folding brace, you will need this 1913 rail adapter >>> modernweaponsystems.com/modern-weapon-systems-mws-cai-vska-bft47-draco-ak47-pistol-blemished-1913-rail-stock-brace-mount-adapter/
Then you can install this folding brace budsgunshop.com/product_info.php/products_id/124614/sb+tactical+tf+1913+picatinny+left+side+folding+pistol+brace+black ,
Stay safe & have a great day!

Here ya go Jose`!
budsgunshop.com/product_info.php/products_id/134179/sb+tactical+aktf+stabilizing+pistol+brace+triangle+side+folding+for+ak+black

Try looking at this: budsgunshop.com/product_info.php/products_id/134179/sb+tactical+aktf+stabilizing+pistol+brace+triangle+side+folding+for+ak+black

Good morning to you!! The SB Tactical AKTF Stabilizing Pistol Brace Triangle Side Folding for AK Black is a good choice for your Century International Arms Inc. BFT47 7.62x39 Semi Auto Pistol. Another choice is the SB Tactical TF 1913 Picatinny Left Side Folding Pistol Brace Black. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
budsgunshop.com/product_info.php/products_id/124614/sb+tactical+tf+1913+picatinny+left+side+folding+pistol+brace+black --
budsgunshop.com/product_info.php/products_id/134179/sb+tactical+aktf+stabilizing+pistol+brace+triangle+side+folding+for+ak+black

Hi Jose and welcome. The Magpul BTR Brace is popular as shown on this AK BFT: - recoilgunworks.com/bft47-7-62x39-12-6-magpul-btr-brace-ak-pistol/ ------------------- Or you can use the following 1913 brace adapter and Brace: (Currently out of stock at Buds)-- budsgunshop.com/product_info.php/products_id/134180/sbtact+ba-ak1913+ak+to+1913+brace+adapter+ak4774 -------------------------------- budsgunshop.com/product_info.php/products_id/124614/sb+tactical+tf191301sb+tf+1913+picatinny+left+side+folding+pistol+brace+black -------- The finished 1913 brace/adapter will look like pictures 3 & 4 when finished here: - modernweaponsystems.com/modern-weapon-systems-mws-cai-vska-bft47-draco-ak47-pistol-blemished-1913-rail-stock-brace-mount-adapter/ ------- Cheers and stay safe!