"Take up" and the first stage of a two stage trigger should be very different. The first stage on a two stage trigger has definite resistance, whereas take up is simply that...with very little to no resistance.
Why would you think that, Edward? Seems to not be "out of place" in my AR. Why would you think that an AR trigger should pull differently than a Remmy 700 trigger?
I've been shooting military style rifles most of my life and that's what I'm used to. AR's, M1A's, MN, 91/93's, M1's, all have 2 stage. It's just ingrained in me to expect a 2 stage type pull when I pick one up.
Geez if I put a single stage on my AR I'd prolly ND it when trying to take up the slack!
Single stage triggers prolly work fine in AR's. Truth is I've never shot a mil arm with a single stage trigger. I could prolly get used to it but my subconscious wouldnt be expecting it if it happened to be a stressful situation. If I tried one and liked it, I'd prolly have to change all my 2 stage's for singles. Now bolts and ss rifles are a different story, I expect them to be single stage.