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Hi Hao Yu, vertical grip is not compatible with keymod or m-lok rail systems. You would need this M-Lok to picatiiny adapter https://www.budsgunshop.com/product_info.php/products_id/114295/magpul+mag596-blk+rvg+m-lok+adapter+rail+polymer+black+1.9+m-lok , Stay safe & have a great day!

Hi Hao and welcome. To add the foregrip to an M-LOK Handguard you would need this M-LOK to Picatinny rail: https://www.budsgunshop.com/product_info.php/products_id/106844/bravo+mcmr1913n3bl+bcm+m-lok+compatible+picatinny+rail+section+3+polymer+black ------------ Cheers, stay safe and enjoy!