This guide details the Fightmaster Method for staking an AR-15 castle nut, emphasizing proper tool selection and technique. It highlights the importance of receiver stability using a Geissele Reaction Block and a Starrett 117C center punch. The method focuses on displacing material from the end plate into the castle nut notch to prevent loosening due to vibration, with advice on punch placement for optimal results, especially on hard end plate materials.
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