Loctite will work but if you ever need to remove it in the future it might damage the receiver extension threads or buffer tube threads. That's why staking is prefered.
Staking is easy and quicker than using loctite, just take a punch and drive a small bit of metal into the staking slot. Won't damage threads on removal.
If you are going to use blue on aluminum(not a recommended practice) only use one tiny drop. It only needs to stop the nut from walking under firing.
I'm not a fan of blue loctite for firearm use. Its got such a low melting temp that makes it pretty useless. I prefer rocksett as it will not damage threads due to its lower sheer strength and will not melt as its critical temp is higher than it takes to melt barrel steel. If your going to use anything use rocksett where you would look to use blue.
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Last edited by JonM; 10-08-2013 at 04:20 AM.