Both Rise & Elftmann make several models; the Rise trigger to buy if you want the highest level of performance is the RA-535 Advanced Performance Trigger.
With Elftmann, the Match Trigger & the 3-Gun are both great; they both have a half cock notch & are adjustable from 2.5 - 4 lb.
The Rise RA-535 is non-adjustable at 4 lb. & is a little heavier than I'd really like, but probably the cleanest trigger AR trigger I've pulled. Noticeably crisper than any of the Geiselle's that I have.
The Elftmann Match is about as clean, but can easily be adjusted down to 2.5 lb. & with the half cock notch, is very safe.
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