in praise of the model 40...
I haven't tried a new SP101, but at this point (200 rounds, lots of snapcaps) my M40 trigger pull is better than my friends older SP101, no grit to it. I havent tried this yet on any piece, but an old salt range buddy suggested a back woods trigger job on a 642, dryfire a good bit, spray it full of WD40, blast it out with 25-30 lbs of air from a compressor, spray it full of BreakFree, blast it with the compressed air again, and you are good to go.
As I said,my hands and fingers are long, (XXL, but not beefy) , so to fit my trigger finger in a J frame, I kind of back away with the top web of my hand, unless I jam the trigger finger in to the second segment, then my web puts the grip safety down reliably. Otherwise, at first, I wasn't always getting it depressed. This is probably going to change for the better when I receive and install the Tyler Tee I ordered for it. Right now I use a rubber band to depress the grip safety, which also adds some padding and grippability
I really like it, I think it is beautiful, I like the small compact heft of it, the trigger keeps getting smoother, the pointability and sight alignment are fine, no regrets at all, it is a keeper for me. As always, YMMMV.