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The cam follower pin slides in the helical slot in the locking sleeve and makes the locking sleeve turn when
the bolt is opened or closed. It is this rotational movement that locks the lugs in place in the receiver when
the bolt is closed. (locked bolt) When the bolt is opened, the lugs move from their locked position in the
receiver and the bolt is unlocked.
The locking lug slots are found in the following locations
a) Model 31: ahead of the loading slot
b) Model 11: aft of the loading slot
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