Sounds like a request. I'm not sure what your menu has to do with it, either.
Thinking about this, you might want to catch the attack event, check if it's a gun with ammo, and then set the clip ammo to 0. You might also want to adjust the backpack ammo.
Maybe there's a "golden gun" plugin (golden gun from Golden Eye 007 has one bullet per clip), but I haven't searched for it.
Look for VEN's tutorial on catching shots in CS in the
Code Snippets/Tutorials section.
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