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There are two JP AR15 trigger kits - one is discrete parts; the other is a pre-fab assembly designed for a much easier drop in. Both are single stage.
I also have a rather old fashioned idea about "customer satisfaction." You'll notice that we don't have any fancy fine print guarantees with our products. My policy is simple: if you're not happy, I'm not happy. I only guarantee one thing, your satisfaction. Ask one of our customers. They're our best salespeople.
Instructions are posted at www.jprifles.com - http://www.jprifles.com/instructions/Rifle/JPFC.pdf
The posted instrucitons are for the traditional unit. The drop-in module is much easier - just a few adjustment screws on the units, push out the pins in the received and put the unit back in. JP only offers a small pin (non-Colt) version though.
JP offers installation of the traditional unit for $65, which includes return shipping.
If you preference is for a single stage trigger, these things are second to none. Check out JP's customer satisfaction policy and compare it to what you find on the other suppliers web sites: