Storing an AR-15 with the hammer down (forward) or hammer back (cocked) does not impact spring longevity; springs wear from cycling, not compression. The 'rack safe' military procedure, requiring the hammer forward, is for visual confirmation of an empty chamber and selector position, not firearm preservation. Ultimately, personal preference dictates storage method without affecting the rifle's lifespan.
This video addresses the common concern that leaving magazines loaded can damage the spring. Hickok45 explains, based on expert consensus, that static tension does not degrade magazine springs. Instead, the primary cause of spring wear is the repeated cycle of compression and decompression associated with loading and unloading or firing the firearm.
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