of all the stock trigger groups i've used, only one has been good enough to not mess with. most times the main thing i'll do is polish the contact area on the hammer. that is where the gritty feel comes from. no filing, no grinding just polish the small flat surface. i use 2000 grit wet dry paper and wd=40 to make sure its smooth. just a light buff. then i use a popsicle stick, wet it and use 5 star metal polish to shine it to a mirror finish.the area is so small it's hard to work it properly, thats where the popsicle stick comes in.then some good lube to finish the job. if the trigger itself(not the hammer) is so rough that you need to remove metal to make it smooth, forget it. it's hardened and if you remove the outer hardened layer you'll ruin the trigger.i've bent the springs a touch but don't like cutting on them. just be happy with an improvement but don't expect magic. if you want perfect, spend the money on a good trigger. a 50 percent improvement in feel is achievable in reworking a stock trigger.