Here's how mine measure up:

These all have the flat face kit:
pro series 9 runs 4lbs 5.4oz average over 5 pulls
My Performance center 40 runs 4lbs 5.2oz average over 5 pulls
My shield 40 runs 5lbs 6oz average over 5 pulls

My 40 pro series has the competition spring and sear kit with the stock trigger and it averages 3lbs 10oz

Edited to add that this is measured with a Lyman digital pull gauge