Best to seek the help of a gunsmith if you don't have a manual
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Steps:
1) Clear the weapon (make sure no rounds are in it)
2) Remove the magazine
3) Pull down on the trigger guard
4) Pull the slide back (with the trigger guard down)
5) Lift the back of slide up (when it's in the full back position)
6) Slide forward and it is apart.
Revers the steps to re-assemble. This is a lot like the Walther PP's that it was a rip-off / clone of.