I know there are quite a few threads on this but here goes:
I bought some extra hammer and trigger springs to try this on a 24" HBar that I feel is more suited as a varmint/range use/long distance rifle rather than a go-to/SHTF rifle. If there are some FTFires, it's not that big of a deal.
I tried the JP spring kit but the trigger return spring was weak enough to allow the trigger to BIND if you let off halfway before squeezing it through.
I decided to follow the 15 min trigger job instructions, including bending the hammer spring leg a little in the direction of the spring winding (according to the instructions, this should give 100% primer ignition). I used trig to figure out how much is 25* for the trigger spring legs, which ends up to be about 3/16" - 1/4" height when you put the legs flat on a table.
The trigger pull went from 7-7.5 lb down to a 4.5 lb - 5 lb pull. It was a significant enough change IMHO. The next question would be its reliability in igniting primers on the ammo I shoot (Wolf, only some LC, Federal and Winchester commercial).
The other alternative to me would be the $170 Accuracy Speaks drop in comp trigger. But $170 is a lot of dough to spend just to get a good trigger pull. I'll use this 24" AR setup for the test rig to see how reliable it is before attempting it on my M4 build.