WHAT DOES GLOCK NOMENCLATURE DIAGRAM MEAN?

I'll acknowledge that the .380 doesn't have rather the umph in the 9mm but Here is the only gun in my arsenal that I can regularly "Double Faucet" into the center with the Bullseye at 7yards. The recoil is nearly non-existent, I am back on target as rapid as I'm able to pull the trigger.Pulled out my worked S&W-442 and just aced it at identical len