I’m still curious how you press the decocker, the gun fires and your thumb doesn’t get injured...?
Here is a video of a guy using a 10mm glock to do this. Feel free to skip about 1:30 in where he actually does it with a single thumb.
One day Buddah was sitting under a tree.
A knight walked up and said: "You look like a Pig."
Buddah replied: "And you look like a god."
The knight, obviously puzzled asked: "What makes you say that?"
Buddah replied: "My son, we see in others what we see in ourselves."
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I don't think I can decock a P30 with a loose thumb. In addition, comparing to a Glock, some of slide's energy in this case will be absorbed by cocking a hammer back and having to compress hammer spring.