Can't speak for all designs, but there is no true slack/pretravel in a Glock trigger. When the trigger begins moving the trigger bar also begins moving. And that means that if the trigger "pretravel" is removed in a Glock then the striker is no longer "half-cocked", it is fully cocked. Part of what that "pretravel" does is complete the striker cocking action.Basically, a Glock that someone has messed up by removing the pretravel with an aftermarket trigger.
I never thought a half cocked striker fired pistol could ignite a primer, until I saw it personally from a bubba'd gun.
Modifications that alter the trigger travel length in a Glock are potentially very dangerous. They can disable all of the passive safeties AND leave the gun in a fully cocked state-something that only normally happens when the shooter has pulled the trigger all the way to the trigger break point.
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