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SAE J995 Grade 2, 5, 8 Finished Hex Nuts for Egypt Factory Related Video:
I discuss AR15 castle nut wrench options and provide a short review of the USGI armorers castle nut wrench (a recent acquisition).
Link to the M4 technical manual below. Castle nut section on page 249
https://www.kdeguns.com/ar-manual/M4%2016%2023Pchange8.pdf