Agree. That hammer is only making it to half-cock. Behaves exactly like underloaded or over-aged and weak ammo in my .45 Auto 1911. That extractor claw looks fine, and the spring could still be weak, but given the half-cock, my expectation is it just isn't getting the case clear of the chamber or hitting the ejector nose, so everything slides right back in. Pick up some fresh ammo, possibly with the next heavier bullet weight and see how that does.
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