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![Receiver Extension Nut (castle Nut) Receiver Extension Nut (castle Nut)](graphics/en-US/cssui/blank.gif)
To secure lock plate on an adjustable stock for AR15, M4.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov.
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