My wife's experience with a garter belt holster tells me I don't need to get near an ankle holster. The problem with any device that wraps around your leg is the leg is larger at the top and smaller at the bottom. Unless you strap the holster on so tight it's uncomfortable it's going to slide down.
"I do not aim with my hand; I aim with my eye. He who aims with his hand has forgotten the face of his father.
I do not shoot with my hand; I shoot with my mind. He who shoots with his hand has forgotten the face of his father.
I do not kill with my gun; I kill with my heart. He who kills with his gun has forgotten the face of his father."
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