It took 27 working days for my Viper plate. I love the Viper but the locking screws are so low on the red dot that they are obscured by the rear sight so you have to remove the sight to lock them in after zeroing. Just don't forget to loosen them before putting it on the first time and of course no blue Loctite on the red dot screws until you are really sure about the zero. Of course, with a FFL in your tag name you probably know all this beforehand. Co-witness is very good on the Viper I think.I just put in a request for the Vortex Viper optic plate. It said 10 to 14 business days.