Something that surely will never happen under the panic induced stress of an imminent deadly threat.
Many Big Name Instructors such as Farnum, Vickers, Suarez and Yeager have banned the Serpa. I wonder why? The Serpa in my opinion is a poorly designed but brilliantly marketed holster that is susceptible to debris disabling the locking mechanism and promotes Negligent Discharges resulting in injury when used under stress. I will not allow it's use in any class I teach.
Blackhawk Serpa Holster - Wilson Tactical Training, LLC.
Again, on a static range this holster seems like a good design. Under the tense, uncertain, and rapidly evolving conditions of a force on force encounter this holster is a disaster.