I didn't find it very difficult to do.
Czechpoint won't ship a standard mag catch to CA. Apex Gun Parts only recently started selling them, and that's what motivated me to do this.
I found this video very helpful:
Originally Posted by mdouglas1980
This is good news for me; I was planning on ordering a VZ 58 from Czechpoint and replacing their lock with the Solar Tactical one (while the pistol grip was off ofcourse too).
Is it difficult to take the Czhechpoint mag lock and replace it with the standard mag catch?