It is 5.5lb. The added bump on the trigger bar on gen 4's increases the travel resistance resulting in a felt heavier pull.
This will decrease with use. Buy a Glock 3.5lb connector & it should feel better. The actual pull is not 3.5lb but more like 4.5-5lbs.
Ebay seller smittywee always has the Glock connectors.
I have these in my gen 4 G22, gen 3 G27, & gen3 G17 & carry them all, no worries about CC.