This is what I was wondering. Unless the OP is going to an A1/A2 or UBR type stock there is no reason to remove that high quality Colt buffer tube.
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Admittedly im not very mechanically inclined. About the only thing i can do on my own gun is clean it and swap stocks. other than that im pretty much lost. That being said dont kill me me for asking but all those pictures in the thread look the same to me. I noticed that some of the notches lined up but thats it. what am i missing? Sorry for derailing this thread :confused:
You are looking for metal from the end plate being displaced into the little notches on the castle nut. The displaced metal keeps the castle nut from rotating off. The castle nut should be torqued enough it wont come off on its own but staking is a secondary measure to ensure the castle nut does not loosen.
You can use a punch, center punch, or really anything that will 'smash' metal from the end plate into the notches on the castle nut. I personally use a small nail punch and a light ball peen hammer to do mine.