As a follow-up, I just thought that I'd mention again how much of an improvement over the OEM trigger the one that Art Neergaard at ShootingSight.com is...
When I first installed the trigger and tried it, I thought, well, crap, it's so light that it's dangerous. Must be about a 1 lb pull...
So I threw the gage on it and, well, 5 lbs, just like Art said...
It's just that it's such a dramatic improvement over the heavy, crappy OEM trigger (my apologies to those who like the original trigger) that it feels so light when you first try it after installation.
I've been shooting the rifle a bit and am extremely happy with the trigger. For those of you sitting on the fence about coughing up the money for the ShootingSight trigger, my advice is to bite the bullet (so to speak) and just get one. After installing and using it, you'll kick yourself for waiting so long before doing it...
I'm still not completely happy with the accuracy of the ARX-100 I have, but I certainly can't blame the trigger anymore...
Forrest