Welcome to the forum! 
For most of us, a holster that's properly designed and constructed for your specific weapon has no need for additional retention devices.
An argument for an exception can be made for LEO's/security professionals that could be expected to routinely end up rolling around on the ground struggling with a suspect.......most of us don't have that kind of concern however.
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"Far better it is to dare mighty things, to win glorious triumphs, even though checkered by failure than to rank with those poor spirits who neither enjoy much nor suffer much, because they live in a grey twilight that knows not victory nor defeat."
Theodore Roosevelt
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