CZ858 Mag Release Install Problem

You need to remove the little retaining pin first.

Looking inside the receiver you should be able to see end of the split pin with a little retaining nub on one leg of the pin. Using a punch knock it downwards and out. It needs to be pushed out before the mag release/BHO pin can be removed.
 
If you push the hooked leg of the pin into the hole you can pretty much push it out by hand with a punch, or at least with a light tap of a hammer.

That's it.
 
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