CZ 455 bolt disassembly tool
thingiverse
This is a quick tool I designed which makes it much easier to disassemble and reassemble the bolt of a CZ 455. I have not tested it with a 452 or 457, but it will likely work. Native cad in solidworks is included, so feel free to modify. I don't know why thingiverse still makes you submit STLs - use the 3MF instead for better resolution and faster slicing.
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