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Now you worry about safe????????????????????

Right stage 2,go to Repco and buy some Frostplugs to fit down the barrel,center dill them to 10mm,and drift them down to the 9mm insert.once you figure out what a frostplug is you'll work it out.
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You've got a grinder,French it,fill the gap with "no more gaps".9mm aint got that much recoil:D

Toby,there may be a hole in that shaft,compress the spring then slip a small Allen key or nail to hold it then slip into place and pull out nail