If this is for a WEAPON (i.e., duty/defensive gun), then you do NOT want an adjustable (with set-screws) trigger.  Several manufacturers make no-set-screw triggers, including Accuracy Speaks, Knights, RRA, Armalite, and probably others.

The Jewell and JP triggers are set-screw adjustable, so they should be limited to range guns (where the setscrew adjustments will do the most good, and where they won't be involved in a life-and-death situation).  They're great triggers; you just don't want something going out of adjustment at a critical time.

-Troy