If i buy this, would i be able to put a custom sight on? Like a red dot sight?

Recoil weapons already come with fixed front and rear sights on top of the weapon for aiming. We do not officially support any add-on sight attachments such as red dot sights. They may work depending on the sight you have and whether it can securely attach to the top of our Recoil weapon. Be aware that it may block the current fixed sighting on the weapon or the fixed sighting may block your custom sight