Originally Posted by
MarkCO
Skip, most striker fired pistols have a similar block (striker block) that is a plunger in the slide. If the trigger bar surface intended to depress the plunger does not push the plunger up (as normally held) then even if the striker slid off the sear (or link or crucible), the block would prevent full travel and thus no primer impact.
In an attempt to get a "better" trigger pull, the edges of the plunger get rounded (not bad) and or the spring removed (can be bad) or the plunger removed entirely (bad, but some argue not against some rules). Some aftermarket triggers allow the take up to be adjusted and so they essentially engage and start to move, or entirely move the plunger which bypasses the safety.