It is just likely the fact that the bolt clears the barrel lug a little bit before the trip engages the bolt. Thus the barrels being able to be opened and the lever not being held open. This is really a moot point since in order to do this, you are moving the lever so slowly to be able to notice this little bit of of a timing issue. Under normal operation, the lever is quickly opened to its fullest travel and the breech opened, so the trip catches as intended.
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B. Dudley
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