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Its speaking of the rail on the bottom in front of the trigger. This doesnt have anything to add a red dot. You could purchase items separately to add a red dot like a dovetail red dot mounting plate that replaces your rear sight. But as is you cant add one. Sorry but hope this helps.

Tyson, it is the accessory rail on the bottom. There is a rear sight replacement option to add a Red Dot available (Note there is an old and newer rear sight slot) : https://opticsfactory.com/hang-gun-accessories/glock-mount