There is a pushrod that actuates the safety when the toplever is moved to the right. When the toplever returns to the center and the safety is in the 'ON' position, the pushrod is no longer held securely between the locking mechanism and the safety lever. Also, the hole in the stock must be large enough to allow the pushrod to travel uninhibited, thus, making the noise.
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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