More data needed...
When the toggle stays half open, is it jammed against the spent cartridge, or is the gun catching the toggle and keeping it open?
Can you (safely at the range) manually cycle a full magazine thru the gun by repeatedly raising the toggle and letting it fall on it's own?
Any signs of damage to the spent case?
So it extracts the case from the chamber but does not throw it clear of the gun? Then it pushes it forward and jams the case into the gun?
dju
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