Assuming you're dry firing and simulating a cycle by actuating the slide after trigger press, then release, the SRT should be a 3mm reset. I could be wrong, but I believe Glocks are 4mm.
FYI, there's also a "short trigger," a thinner profile trigger, that often gets confused with SRT. My P229 SAS Gen2 has both. That P226 has the standard profile trigger.
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