I would put some red loctite on the gas block and that's it. I made the mistake of using blue loctite on my castle nut then I had to remove it to install my new receiver end plate... long story short my buffer tube is now on an aluminum scrap pile.

1 1/4" Crows foot wrench

1/2" Drive torque wrench

Auto center punch (for staking your castle nut)

u/ByWillAlone · 1 point r/ar15

This is the barrel wrench I got:

https://ads.midwayusa.com/product/288479/pri-barrel-nut-wrench-with-extended-handle-ar-15
Solid piece of kit. Can use the handle for getting it close, then pop in a torque wrench to finish it. Just be sure to use proper torquing technique when using an extended tool like that.

For buffer tube castle nut, I got this (maybe not this exact one, but something very similar):

http://www.brownells.com/gunsmith-tools-supplies/rifle-tools/wrenches/ar-15-m4-stock-wrench-prod16882.aspx

When I later installed a free-float handguard, it came with its own barrel nut that doesn't even use my barrel nut wrench. I ended up having to buy this crowfoot wrench and make it thinner with a grinder to fit over the new barrel nut. So, now I have one of these also:
https://www.amazon.com/gp/product/B000I1R28E/ref=oh_aui_search_detailpage?ie=UTF8&amp;psc=1

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Reddit mentions of Sunex 97740A 1/2" Dr. 1-1/4" Jumbo Crowfoot Wrench CRV

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Found 2 comments on Sunex 97740A 1/2" Dr. 1-1/4" Jumbo Crowfoot Wrench CRV:

This is the barrel wrench I got:

For buffer tube castle nut, I got this (maybe not this exact one, but something very similar):

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