I suspect the bolt isn't fully closing... If your sling-shotting it closed, you should clean the bolt AND next time try loading only 9 rounds into the mag and see what happens.
I would also pull the firing pin, check its spring, etc..
IMHO Your gunsmith isn't even close with the hammer spring idea.
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Originally Posted by BannedinBritain
The only dumb question is the one you don't ask...and get arrested for later.
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