I have said the Gen 5 has a better trigger and been looking for some confirmation of this. I found it. Look around 3:47 at what this Navy Seal says:
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What exactly are 'the front action block holes' and where are they??Naw...I already figured out the problem.
The Gen 5 trigger bar gets worn around the front action block holes
But every used Gen 5 I've handled in a gun store with any wear on it exhibits this degradation.