A new slide stop....is it because it'll sometimes lock open with rounds left in the mag?? Mine did that...had to "dress" the part of the slide stop that engages the magazine follower back a little because it was getting nudged into lock by the ammo...
The 185 ammo "should" work fine, I just decided to go with the regular 230 ball due to availability and since it was coming out of a short barrel with a reduced velocity and a lesser chance of expansion anyway, I figured it would be a win/win situation all the way around