Greetings Dannyb,
This is an often overlooked problem with a delayed fire. If someone has fiddled with the trigger and has not left enough overtravel so the sear can release cleanly the striker can hang up for a moment thus delaying the firing pin fall. The problem can vary with conditions. My bet would be this or a bolt full of crud. Modern ammunition will seldom give problems with hang fires if everything else is in order.
Regards Grandpamac.
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