Can SP101 trigger housing's be swapped between other SP101's? For instance, I have one in 9mm and the other in .357. I like the trigger better on one and want to trade it to the other. Is that possible?
I don't think so. The housing to frame fit is polished in place and the internals have to be fitted so as to opperate properly with the rest of the gun.
The solution is to have a trigger job done to the one that needs it.
The 9mm gun is a short frame and unless the 357 is for 125 grain loads only, that one is a long frame. There could be a great difference in the placement of trigger parts within the housing.