3.5# is standard on the model 34 and 35 target pistols.
6# is standard on the rest of the line, with an optional 8# disconnector that can be installed by a Glock armorer or any competent gunsmith. The New York City Police Department wanted a 12 pound trigger, so Glock made one since they issue about 40,000 handguns.
Keep in mind that the Glock trigger, even at 12 pounds, is a short trigger pull and if the trigger is pushed backwards, the pistol will fire. This is where they got a reputation for being “unsafe.” People who are not knowledgable in safe firearms handling buy Glocks because they are popular, and they put their fingers on the trigger, and . . .
If the shooter handles it properly, it is an excellent gun.
Thanks, Sig!