Someone once told me about various AR15 match triggers, both single-stage and two-stage.  I think he talked about Jewell, Compass Lake, JP, and Knights.  He said he preferred one of these over the others because he could change the trigger pull weight with simply a screwdriver, while the parts were still installed in the lower receiver.  Trouble is, I don't remember which one that was.  Could someone here please enlighten me in the differences and benefits of each one?  Thanks in advance.

The trigger pull of the Jewell 2-stage is adjustable in the gun with a simple tool provided with the trigger/hammer kit.  

The JP single stage is not.  It's pull is determined by the springs provided with the hammer/trigger kit.

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