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Here's all the info you want on the DB15 series. https://diamondbackfirearms.com/db15-series-2/

Hi Vlademeir and welcome back. It is M-LOK. You will need an M-LOK Picatinny Rail section to add an accessory. https://www.budsgunshop.com/product_info.php/products_id/714029453/santan+m-lok+5+slot+picatinny+rail

Hi Vlademeir, it is a MLOK rail under the barrel. Stay safe & have a great day!