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Gideon, this will change the classification from a Pistol to an NFA firearm requiring a $200 Tax Stamp and NFA Registration. https://www.guntrustguru.com/can-i-add-a-vertical-fore-grip-to-my-ar-15-pistol.html ------- You would need : https://www.budsgunshop.com/product_info.php/products_id/30184/grovtec+rail+section+keymod --- and ----- https://www.budsgunshop.com/product_info.php/products_id/723007627/ncstar+ar+folding+vertical+grip%2fweaver+
1st get your nfa tax stamp ($200.00) as without it you have a illegal NFA item and can go to jail and loose the right to own any firearms. after you do this any kemod grip will fit or use a kemod to rail adapter but its a lot on money to add a vertical grip