The other commenter is saying the same thing, just in perhaps a less clear way. I think they are saying the Glock’s trigger weight is between what you would expect of a heavy double action and a light single action. The Glock is a consistent weight every time. The design is often referred to as “safe action striker” or often informally just as “striker” fired. The design lacks a large and heavy hammer that needs to be actuated. Many designs after Glocks were introduced have copied this idea, making it a common alternative design to hammer fired.