Good evening to you!! You can legally put a foregrip on this rifle. Anything over 16" is ok. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'merica' 🇺🇸🇺🇸

Yep!

Hello Daniel, yes you can definitely add a foregrip to this firearm because the barrel is 16"+. Hope this helps and have a great day!

Hi Daniel and welcome. Yes Sir. Since it has at least a 16" barrel, you can add a vertical grip no issue. I highly recommend an adjustable vertical grip: budsgunshop.com/product_info.php/products_id/107078/fab+defense+t-fl+7-position+vertical+foregrip+polymer+black ----------------- You will need this M-LOK rail Section: budsgunshop.com/product_info.php/products_id/37323/utg+pro+mturs04s+keymod+picatinny+rail+section+1-piece+4+slot+black+hard+coat+anodized+finish

Hi Daniel, yes sir, you can put a foregrip on a rifle without running afoul of the law, as it has a barrel length greater than 16"
Stay safe & have a great day!