I have read more than one place that when it comes to triggers, there are Jewel and then there are the others. I don't have one so I don't personally know.
I do have experience with two stage triggers though and I tend to prefer them over the single stage. It's nice to have some 'takeup' before the second stage. When you hit that second resistance you know that any more pressure and that's it.
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Shoot straight, shoot often
Matt