The trigger on the Gen 4 seems to be lighter and crisper than the Gen 1,2,3. Part of it is a different connector that is like 4.0 instead of 5. I dropped a factory 3.5 connector in my Gen 4 and could not tell the difference between the Gen 4 one and it. I would also recommend the .25 cent trigger job if you get a Glock--easy and smooth.