Dear friends...
None of this has anything to do with (a) what feels safe to you or (b) pull weights on other guns. After owning a G-34, I decided to work on my new G-26: the typical polish job, and tossed in a 3.5 lb connector: result a nice smooth pull of about 4.8 lbs. Actually my stock polished 34 is noticeably better (admittedly have a LOT more ammo having gone through it).
And for me, I just wanted BOTH my Glocks - the 34 and the 26 - to pull the same, for continuities sake. But after MUCH thought I'm gonna take the 26 back to stock (5 lb/5lb)) or maybe the much discussed NY#1/3.5. After a really good polish job I can get the NY#1/3.5 to about 7.6 lbs (middle), 5.7 lb tip). Although I've not tested the stock G-26, I have little doubt it's pushing 6 lb (middle) or bit more.
None of these pulls are outrageous. But the difference comes after you shoot someone: regardless of how justified, instead of explaining why you felt your life was in imminent danger, you'll be grilled for hours about how and why you decided to be an amateur gunsmith and lower your pull weight BELOW STOCK, and use a 3.5 connector that Glock DOESN'T RECOMMEND.
It's not about right or sensible, it's all about the prosecutor or civil attorney trying to eat your shorts. And they are very, very good at it. With any lightening mods you start out behind the eight ball, and got a lotta splainin to do.
Not a pretty place to be.
It is a sad case that you - the real victim - will be made the "hair-trigger", "gun modifying", vicious "hollow point" using gun nut who couldn't wait to off the BG, or whose tinkered gun went off when it shouldn't have.
You don't need that. What changed my mind?
You just have to read the tons of material about what really happens to you and even well intentioned LEO's in court. And many have gone to jail, lost huge civil actions or had to pay many, many extra thousands of dollars to hire an expert witness to overcome the BS case against you.
It's the way its. So please, don't make the mistake of being logical, and believing that this could not happen to you. Read some of the many good books about concealed carry and SD and realize what really happens after a good shooting...
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ps. another thought: the stock Glock, or even a NY#1/3.5 is not all that hard to shoot, esp. at short range. You may give up only a bit of accuracy for $100,000 or legal fees - and the BG will still be dead.