Properly staking an AR-15 castle nut is a mil-spec requirement to prevent it from loosening under recoil. This process involves torquing the nut to 40 ft-lbs and then using a punch and hammer to deform the end plate metal into the nut's staking notch. While not strictly necessary for basic function, it ensures long-term reliability and is considered a permanent modification, though removable with effort.
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