M70, is that a controlled feed or a push feed with a plunger ejector?
A controlled feed will do that if you really work the bolt fast and hard.
A plunger ejector will do that if the plunger spring is extra strong
Remedies: work the bolt slower on the former type.
OR disassemble the ejector plunger and clip ONE turn off the spring. There's usually a tiny pin vertically through the bolt just behind the plunger. Carefully tap that out AND HAVE A TOWEL OVER THE BOLT, OR THE PLUNGER AND SPRING ARE GONE FOREVER---sprooiinnng! (do NOT ask how I know that - LOL!)
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