That is the trigger that Jerry Miculek uses in the personal AR15-22 he uses for speed shooting exhibitions (like on Impossible Shots). I am sure it is likely the same trigger he has in his M&P AR15 he uses for 3-gun competition.
I went with the JP yellow spring kit ($10) and that did improve my AR15-22 PC model a lot. The PC model comes with a RRA 2-stage trigger and it was not bad although a little stiff. I was more used the the 1.5# Jard match trigger I put in my Remington 597 VTR.
Anyway I found the RRA trigger + JP springs would not reset as fast as I could shoot in steel competition. So I went to a local custom AR builder (Precision Firearms) and he let me play with a number of different demo triggers he had setup including Timney, RRA, JP, and Geissele. The one I found that was above the rest for what I wanted was the Geissele Super 3-Gun, known as the S3G for short by multi-gun competitors. That is the trigger supplied in the new over-the-counter Stag Arms 3-gun AR. Also the one used by several gunshops that appear on here for their local rimfire tactical matches.
But in a twist I decided to try the JP springs in the S3G just to see how it goes. My initial tests were nothing short of incredible. I was able to do the Bill Drill SC practice in 1.47 sec best in part 1, and 1.51 sec best in part 2. I can't do that with my pistol even. My trigger gauge says the trigger is less than 1.5#, so I may put the factory springs back in. Still it has never had a light strike or anything. Got almost another month before my first Steel Challenge event (I won the fall event Carbine Open division last year with the RRA+JP setup anyway). Plus this year's big time PSA Shootout in April is having a big rimfire only side match for pistol and/or rifle or 2 man teams. Maybe Jerry will show up as he did shoot the PSA one year.
The S3G is something of a trigger of a different kind although it was derived from their SSA trigger. It is a 2-stage that feels like a single stage. It has been described as a 2-stage on ball bearings. It is really hard to tell the 2nd stage point as the trigger fires without any increase in feel at all. And a slight relaxing of your trigger finger is enough to reset it.
Some of the other mods my PC model has is a BAD lever, and a Nordic small diameter free floating handgrip, the one from their NC22 upper. It's a modular alloy that is longer than the stock AR15-22 and makes it much easier to hold steady since it is longer and allows you to hold it very far forward. As a result even though it is heavier I find I can transition even faster than the lighter stock quad rail. I also use an Ergo pistol grip as it feels much better than the stock Hogue does. I also added a factory recoil pad to the Vltor stock, not for recoil but because it is very high traction rubber which makes it lock into your shoulder better and firmer. I use a Nordic Tactical comp on the barrel as much for looks as anything else.