Yes. Have 2 rifles with JP's with the Speed Hammers also. Very nice feel at around 3 pounds pull. Little to no takeup or overtravel. Very adjustable with only a small amount of fitting required. I would recommend you also use their oversized hammer & trigger pins. They provide a precise fit and make the trigger function repeatably.
If you are making a true long range "target" AR go with the JP trigger. It is super adjustable with a very light pull, smooth too. You hardly know when you pull it! The stock trigger is nothing like it.
there are two schools of thought on triggers one is from "old" military folks who think a two stage trigger is the way to go. the advantages of a two stage target trigger are you can put your finger on the trigger and not worry (as much) about firing the weapon. you have to have a two stage to shoot service rifle competition and it's just like the crappy military trigger you used in the service.
with a single stage target trigger when you put your finger on the trigger expect it to fire. no creep not take up just blamo!!!. having said this you can adjust out all but about 1/10" over travel(the distance the trigger moves after the hammer falls). if your not careful and you fire the rifle under recoil your trigger finger can "clutch" the trigger again and fire the rifle a second time. so you have to maintain a high level of trigger discipline. this also means you can "tap dance" on the trigger and it will appear to others you are firing full auto. and at 300-400RPM I guess you are. but you can go from "full auto" to single stage target trigger just by how you manipulate the trigger. it's a very powerful tool for the AR if you have the discipline.