Hookeye, you provided good, and relevant, information to the post. Ignore James' sarcasm [ Jimmy, have a Snickers :-)]
Here's my (very) limited experience.
A PSA Enhanced Polished Trigger is a big improvement over straight mil-spec, and worth the sale price. I bought the yellow JP spring but haven't felt the need to install it.
I just installed a Rise Armament single stage trigger and I can't believe how light and crisp it feels. I don't have a trigger force gauge, but it feels a lot lighter than the advertised 3.5# to me. I wouldn't want to it to be any lighter for my deer hunting gun.
I'm slowly acquiring better triggers. The LaRue MBT that I pre-ordered should be delivered tomorrow, and I have a Geisselle G2S in the parts drawer. I am anxious to finish up the project guns to see how much better these triggers feel.
