Gonna throw a vote down for the QLS by Safariland. The parts are wicked durable, the lockup is tight, and there's no real way for anything to come loose. If you look at the system, there's an absurd amount of surface area touching between the two parts: this means that it's gonna take an act of god to break them apart short of activating the release. Next, because it is like material against like material, you never have to worry about any flexion causing part of the system to break another part of the system in the same way as the G-Code.
I don't have anything all that bad to say about the G-Code stuff, honestly. It's good kit, and guys that run it don't have anything but good stuff to say. I just stood back and looked at it from an engineering and design point of view and decided that G-Code was well suited to fixed mounting (car, house, etc) but that the QLS was totally indifferent.
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