Trigger pull should be measured at the center of the finger surface of the trigger. Since the Glock's trigger pivots like that of a revolver, it will have an easier pull at the toe of the trigger than at the center of the surface where measurement is normally made. It's simple leverage.
Yes, I got that. According to the article though, Glock measures from the toe. I have no idea if that's true, but that's what was stated.
I got a little confused reading that article at first, because they jumped from talking about a standard glock and then they gave the measurement for a modified one. Further down I found the paragraph I posted for the stock one.
Why anyone would measure from the toe I don't know. Isn't your finger usually in the middle of the trigger? Mine is, so I agree with you, that's where you should measure. It just makes sense.
Bottom line: if for any reason 6# of pressure is applied to a glock trigger, it's going to go bang.
Same-same a 1911, with the hammer back, safety off, grip safety deactivated.
The 1911 also won't go off if you don't touch the trigger, but I don't think many folks would carry it that way and consider it safe.