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Old February 10th, 2019, 02:50 AM #1
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Little help with some AR specs

So as i learn more and more about my rifles, I find more and more that they are messed up. More so just not built well. In my case its just lack of experience. But I am learning. So i am pretty sure the stake job on my bcg is no good. Now i have not had any problems and i know the rule is " don't fix it unless its broken". But i don't want it to break...So my thought is to get a new gas key...a nickle one with new screws and the tool to do the job right.

So my question is...Do i use a sealant between the carrier and the gas key?
I have a Spikes BCG in Nickle Boron. Also can i just get any key of good guilty as long as its another Nickle Boron? I posted some links to the key and tool i want to use!

Tool
https://www.brownells.com/gunsmith-t...prod29337.aspx

Gas key
http://www.failzero.com/products/com...ey-detail.html

Also i learned i should have a staked castle nut too on my buffer tube and I do not. I have a BCM Tube and new nut... So what should be the torque Spec. and how is that staked? Is it just a matter of pushing metal into one of the inner notches?
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Old February 10th, 2019, 03:04 AM #2
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I have seen worse stakes. Many manufacturers IMHO overstake, the stake should stop the screw from backing out. Witht he the stake you have you could salvage the key. On a side note NiB key really is not needed. If you have to go NiB the Bolt carrier is the only part that needs the coating everywhere else makes little contact.

there is no gasket and there is a good possibility that your BCG has no NiB under the gas Key. IMHO if you are worried your screws are going to back out, mark them with a light stake or scratch a mark and keep track to see what they do after each range trip.
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Old February 10th, 2019, 10:12 AM #3
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First, get rid of those YFS gas key screws. They're junk. Second, seal the interface between gas key and bolt carrier with Locktite 620 and torque the screws to 58 inch/lbs. Lastly, properly stake the gas key.

If you have a fine sharpening stone, it would be a good idea to stone the gas key's bearing surface flat before sealing it to the carrier.
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Old February 10th, 2019, 01:33 PM #4
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OK yes I have seen that the YFS screws are junk. I have Locktite 620.
So in my case would it be a matter of just replacing the screws and re-staking... Or should I start with a new gas key as well. Or is that the purpose of the shaping stone.
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Old February 10th, 2019, 01:41 PM #5
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As long as the gas tube flange isn't jacked up, you can re-use the gas key. Running it over a fine sharpening stone evens it up and trues the surface a bit more.

I think the Army actually uses a permatex gasket sealer but the Loctite 620
will be fine.

I have the same staking tool and, while it does work, if I was to do it over again, I'd buy the MOACK style from Michigan Guns.

http://www.m-guns.com/tool_new.php?product=moacks
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Old February 10th, 2019, 02:08 PM #6
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OP can reuse his gas key as long as it is sound.

Permatex doesn't set hard like 620 and can tend to blow out.
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Old February 10th, 2019, 07:36 PM #7
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Very good. I have a new key and screws coming from BCM and the tool from Brownells.
The BCM key is not NiC Boron but as stated it does not need to be.
So I am going to give this a shot but it looks like no big deal now. Thanks for the help guys.
As for torque spec 50 in lbs sound good?

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Old February 11th, 2019, 06:16 AM #8
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Quote:
Originally Posted by andy41567 View Post
Very good. I have a new key and screws coming from BCM and the tool from Brownells.
The BCM key is not NiC Boron but as stated it does not need to be.
So I am going to give this a shot but it looks like no big deal now. Thanks for the help guys.
As for torque spec 50 in lbs sound good?

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Is the new key chrome lined? It should be.
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Old February 11th, 2019, 08:13 AM #9
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Yes it is

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Old February 11th, 2019, 09:37 AM #10
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