"A Push Knife, like the ASP PDK, is a specialized tool. It’s designed for law enforcement, but can fulfill the same role for security officers and armed civilians just as well. The knives are affordable enough that even if I have an EDC utility knife, I don’t mind having a second quick-access knife as a backup if things ever go severely south.
The Push Knife isn’t the be-all, end-all solution to a weapons retention struggle. However, it is another tool you can have in your tool kit. With its 2-inch blade, it’s small enough to be discreet and doesn’t get in the way when you’re bending, sitting, or moving about.
Some folks may doubt the utility of it, but I suspect the Pittsburgh officer who used his to fend off a gun grab isn’t one of those guys."