I got this straight from FM...
Total pull is 4.5 plbs. It takes about 1.5-2 plbs to remove the take up, total pull is 4.5.
Primary Arms lists the pull weights as ...
Pull Weight 1 - 2.0 lbs
Pull Weight 2 - 2.5 lbs
Total Pull Weight - 4.0 lbs - 4.5 lbs