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Perhaps my answer is very late, but that tool serves to dismount the rifle bolt. I do not know as it is used, but that is the end of the tool.

A greeting

Oscar.

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Infact the tool is used to strip the firing pin spring from the firing pin, the large part of the hole slips over the spring & then the elongated part of the hole slips between the coils the enable the tool to be used to compress the spring so the pin can be dismantled. The screw driver is the correct size to adjust the trigger via the screw accessible thru the trigger guard at least thats how I remeber my ZKK602 & AFAIK the CZ550s are much the same.
Steve.

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