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  #1  
Old 09-18-2013, 8:22 AM
Qwigs Qwigs is offline
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Question Staked castle nut on AR-15?

I just picked up my first AR-15 and in preparation I bought a AR-15 gunsmithing book. It shows the castle nut being staked and seems to indicate this is important. However, my rifle does not have the castle nut staked and it is in fact only finger tight. Is this a problem? Should I at least get a wrench and tighten it or is staking it a requirement?
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Old 09-18-2013, 8:27 AM
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Tighten and stake. Don't use loctite.
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Old 09-18-2013, 8:32 AM
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I've changed end plates and buffer tubes around on my ARs, I'm glad I used blue loctite.
I guess when I finally think I'm done playing legos with them,I'll stake it.
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Old 09-18-2013, 8:47 AM
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Ive done both loctite and staking. Stake if you don't plan to change your endplate or buffer tube. Loctite IMO for later hassle free changes. I would not rely on a finger tight castle nut, you may just find your buffer retainer floating around in your lower after a while and your buffer and spring may jump out and give you a kiss on the chops when you break it down lol.
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Old 09-18-2013, 9:21 AM
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No reason not to stake it.
Staking mechanically locks the castle nut in place. Properly done it works well.
Nut can also be taken off with the same tool used to tighten it. Not too difficult to remove.
I use a spring loaded center punch and stake in two places.
Carry on.
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Old 09-18-2013, 9:41 AM
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Torque it and stake it.
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Old 09-19-2013, 11:49 AM
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Quote:
Originally Posted by Jason25 View Post
Ive done both loctite and staking. Stake if you don't plan to change your endplate or buffer tube. Loctite IMO for later hassle free changes. I would not rely on a finger tight castle nut, you may just find your buffer retainer floating around in your lower after a while and your buffer and spring may jump out and give you a kiss on the chops when you break it down lol.
I agree. Finger tight is nowhere near good enough, but I don't consider staking 100% essential. Crank it down and use a bit of loctite. Staking is fine if you never intend to change configurations again, but that's not for me, as playing AR legos is half the fun... do you glue together your lego kits? LOL
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Old 09-19-2013, 12:09 PM
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I agree with kkp, staking is not essential, none of my tubes are staked.
Look at it this way, the only way for the buffer tube to rotate is for the keyed end-plate to back off far enough to clear the recess in the lower receiver. To so that the castle nut has to complete at least 2 full rotations.
In addition the buffer tube retaining pin is captured in a notched cutout in the tube. In my rifles, I have to push the retaining pin down for the tube to rotate.
Just torque it down with a wrench.
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Old 09-19-2013, 1:05 PM
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Quote:
Originally Posted by autoduel View Post
I agree with kkp, staking is not essential, none of my tubes are staked.
Look at it this way, the only way for the buffer tube to rotate is for the keyed end-plate to back off far enough to clear the recess in the lower receiver. To so that the castle nut has to complete at least 2 full rotations.
In addition the buffer tube retaining pin is captured in a notched cutout in the tube. In my rifles, I have to push the retaining pin down for the tube to rotate.
Just torque it down with a wrench.
Yes and no. Not all buffer tubes have the notch. I know POF does, but most don't.

I stake mine once I am done with changing of that part. I have gone to mostly Noveske QD end plates because I can always thow a quick release on there. If I don't know what configuration I will just tighten it down with the wrench and the lower in a fixture.
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Old 09-19-2013, 1:29 PM
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Quote:
Originally Posted by ar15barrels View Post
Torque it and stake it.
Torque too ______? in/ft pounds or just really snug?

Respectfully,
Kyle
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Last edited by Kyle1886; 09-19-2013 at 2:57 PM..
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Old 09-19-2013, 10:17 PM
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Quote:
Originally Posted by Kyle1886 View Post
Torque too ______? in/ft pounds or just really snug?

Respectfully,
Kyle
25ft-lbs.
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