I bought my gun with one installed. The trigger is a little too light for daily carry. They sell two different spring kits so keep that in mind when picking one.
I installed it on my 40c and love it. It's also my EDC weapon. I have a 9mm barrel for it as well. Not sure where Plainfield is but if you're ever in my area you can try mine out. I have a range on my property so not a big deal.