I cannot say that I love the B19 platform but it was VERY educational. Fortunately it is a very simple platform to work on and modify.An added bonus is that it is so well supported by Crosman as well as after market, namely charliedatuna.com.
Do your b19's shoot the first cold shot the same place as the rest?
I've already gone the route of longer than stock adjusting screws and de-burring/polishing the stock triggers, and it has been a major improvement over factory, but a drop-in for under $35 that doesn't require grinding the safety tang shorter has me curious enough to give it a whirl.
GumpIsrael,Where did you get your roller bearing? I'm having a hard time finding one (5x8x2.5mm), and if I go online they only come in packs of multiples.If I find some, I might try the 3 mm width. Looks like that might fit, and would have a little less side-to-side play. You could only do that if you got rid of that spring in the middle, though.
I cut apart a bicycle chain. I'm not sure of the size but it worked great.