Jewell triggers? Jeez, I wouldn't buy one of those if they were free.
A JP single-stage kit is about $150, and requires some fitting, but it will provide about the best trigger pull out there.
If you don't have the funds for that, you're really better off letting a competent gunsmith look at it. AR trigger parts are case hardened, and if you go through the case in an attempt to polish the trigger surfaces, you'll end up with a rifle that goes full-auto when you least expect it.
Still reading? Okay. Keep in mind, you can ruin your trigger parts by doing this. Don't say I didn't warn you...
Pull apart your trigger group. Throw away the factory springs and order a Tactical Spring Kit from JP Enterprises. Get some of their Boron Nitride trigger/sear prep compound, while you're at it. This should cost maybe twenty bucks.
The JP spring kit also includes instructions on how to polish your stock trigger parts. I'll link to them here.
http://www.jprifles.com/instructions/ReducedWeightSpringSet.html
Polish the sear face and hammer notch to a mirror finish - I use a felt wheel for the sear, and a Q-Tip chucked in my Dremel for the hammer notch. I coat the wheel or Q-Tip with jewelers rouge, and use very light pressure at high speeds. You want to polish, not cut.
Polish the hammer and trigger pins lightly.
Clean the trigger parts well, apply a dab of trigger prep compound to the sear face, and reassemble.
Before you go out to try your new trigger job, test the safety. The hammer should not move at all if the trigger is depressed with the safety on.
Go to the range. Load ONE round in your magazine, chamber it, and fire. Everything copacetic? Good. Single-load a few more rounds. If everything is okay, put two rounds in the magazine, and test-fire. If the gun doubles, STOP! Take the gun to a gunsmith. Otherwise, shoot another 100 rounds or so. If everything works, congratulations on your excellent trigger job. If anything malfunctions, get thee to a gunsmithery!
If you have any problems with those instructions, again, the best bet is to find a good gunsmith.
Good luck. Let us know how it goes.
- Chris