w00t! Superior American education wins! j/k.
Marine:
If you want to be REALLY sure that the slide wont break in two years, you could always fashion a flow restricter from an old CC.
While putting more stress on the front section of the slide during the first stage of blowback, and more stress on the BBU/Hop unit when the slide slams home...
If you just want to use the BBU, then any metal kit will do. If you want to use the striker pin styled hammer sytem, then you should go with a magna frame.