Hi Alyssa, if you are talking about a tactical flashlight, the Max-9 does not have an accessory rail and there doesn't seem to be any lights that fit this gun.
Read this thread >>> reddit.com/r/ruger/comments/12oty2s/anyone_know_of_a_max_9_flashlight_attachment_ive/
Stay safe & have a great day!

Hi Alyssa and welcome. This model is Optics Ready for Red Dot Sights . Red/Green Dot selection guide for the Ruger Max-9 here: https://freedomgorilla.com/blogs/news/4-best-ruger-max-9-and-max-9-pro-holosun-optics-red-green-dot-sights-how-to-mount?collection ----------------------- If you meant a laser instead of and Optic, this model will fit: budsgunshop.com/product_info.php/products_id/163098/viridian+e+series+green+laser+rug+max9 ---------- Cheers and stay safe!