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AR-556 Gas Block-change

This is a discussion on AR-556 Gas Block-change within the Gunsmithing forums, part of the Firearm Forum category; Thinking of installing short gas block to replace the tall A2.. What issues? Does the A2 mandate tall scope mounts? Rather have "flattop" What issues ...


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Old January 2nd, 2017, 03:56 PM   #1
 
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AR-556 Gas Block-change

Thinking of installing short gas block to replace the tall A2..

What issues?
Does the A2 mandate tall scope mounts? Rather have "flattop"

What issues with hand guard- would like longer one to move flashlight out front..?

Suggestions appreciated..



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Old January 2nd, 2017, 04:12 PM   #2
 
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Order a low profile gas block from Midway, PSA, Joe Bob, or many others. Replace existing handguard with free floating keymod handguard of desired length. Samson makes one easy to install using existing barrel nut. New handgurad will slide over low profile gas block. No issues at all, you will have a full length rail to mount optic of your choice. Install 45 degree MBUS sights to have no conflict with your optic. No need to worry about raised mount for optics.

Last edited by jdavis; January 2nd, 2017 at 04:15 PM.
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Old January 2nd, 2017, 04:13 PM   #3
 
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Thanks!
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Old January 2nd, 2017, 07:34 PM   #4
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Also remember if your running the standard a2 sight and lets say a magnified 3x9x50 even if the post is directly in the path of the optic, you will not see it. Dont believe me, just try it. No need for risers unless you want the optic higher for proper eye alignment / cheekweld. Alot of people fall victim to that assumption, but you do not have to swap the gas block to get a clear sight picture through a magnified scope.
You can switch the handguard to a magpul moe, and install an m lok rail panel which will allow for a flashlight. You can also swap the handguard for a quadrail, non or free floating, get a clamp on yankee hill gasblock and hide it under the rail if you choose a longer length.

The options are endless really, its like eating at a steak house, you can eat poorly or well depending on how much you are willing to spend.
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Old January 2nd, 2017, 08:00 PM   #5
 
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When you remove the pins from the stock A2 front sight, the area on the barrel where the taper pins were drilled will be exposed as well as the area of the barrel that is unfinished under the gas block, if you go with a standard low pro gas block.

Many gas blocks are approx. 1" long. If you want it to look clean go with a 2" gas block such as the Troy Industries Gas Block, 2" .750.

Did one recently on a friends rifle and we found it (the Troy Ind.gas block ) the cheapest at... believe it or not... Walmart online for about $52 + free shipping. Just checked and they still have at least 5 left in stock. Walmart# 553424323

He replaced the stock handguard with a very thin Keymod handguard and clearance was perfect with the Troy Industries 2" long gas block. Plus now he can mount accessories anywhere along the handguard he wants to.
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Old January 2nd, 2017, 09:12 PM   #6
 
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Also, you don't HAVE to change the gas block. You have the option to just cut it down and dress it up. Have done several this way. If you install a longer free float handguard, it's covered anyway
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Old January 3rd, 2017, 06:04 AM   #7
 
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I just put the MOE m-lok on. Wondering- it locks into a front and back "ring".

How does a floating hand guard attach- are the rings left on or removed?

I plan to install a Nikon 3-9x50 scope. The 50mm is for better low light. Longest shot 100 yd+-. This scope needs tall mounts just to clear my 30-06. When I get time, I'll check out the clearance.

Thanks for the input!!
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Old January 3rd, 2017, 06:34 AM   #8
 
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Welcome to the forums.

These questions get discussed fairly regularly here and a search would get you a lot of what you're asking.

Jeff
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Old January 3rd, 2017, 11:42 AM   #9
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Quote:
Originally Posted by drmajor View Post
I just put the MOE m-lok on. Wondering- it locks into a front and back "ring".

How does a floating hand guard attach- are the rings left on or removed?

I plan to install a Nikon 3-9x50 scope. The 50mm is for better low light. Longest shot 100 yd+-. This scope needs tall mounts just to clear my 30-06. When I get time, I'll check out the clearance.

Thanks for the input!!
When you use a free floating handguard the hand guard cap at the front near the gas block and barrel nut and compression ring on the receiver are removed. The new quad rail will have its own barrel nut, which the new free float rail will attach to by threads or clamping on. So nothing touches the barrel except the barrel nut.

Clearance will be determined by what particular setup your rifle has. May be able to get away with extra high rings, or may need risers to clear the handguard for the 50mm. You will have to check and see. You could also use a burris pepr mount, it will work, either quick release version or bolt on version with no additional risers.
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Old January 3rd, 2017, 11:57 AM   #10
 
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Thank you... didn't know about the pepr mount. Great idea.
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Old January 8th, 2017, 07:45 AM   #11
 
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The rings that hold the stock hand guard , how easy do they come off?
Or, can they be left on when longer hand guard is installed?

I have a temp 40mm scope mounted and with my large(13) hands, the charge handle is fun to use. Suggestions?
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Old January 8th, 2017, 08:06 AM   #12
 
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One issue you might run across is not properly lining up the gas port on the gas block with the hole in the barrel. The front cap or ring at the gas block also spaces the gas block away from the shoulder a little bit. Since you remove that ring when installing a free float handguard, you need to keep this in mind.
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Old January 8th, 2017, 08:16 AM   #13
 
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Also, if you get an adjustable gas block, something I did and didn't think about the issues that would occur, I installed a 15" handguard on a 16" barrel and it's a carbine length gas system. I would have needed a foot long Allen wrench to reach the adjustment screw, so I needed to remove my handguard while setting up the gas block. Only an issue at first, once the gas has been adjusted properly, it doesn't get messed with.
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Old January 8th, 2017, 10:00 AM   #14
 
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Looks like gas block and new free float guard are getting up to $200.

Might have to stick with M-lok stock length for a while...

Strangely, the A2 sight barely bothers the 40mm scope, only slight fuz in lower area when at 3X zoom.
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Old January 8th, 2017, 10:27 AM   #15
 
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Just do like msp3903 said and cut the factory one down. Then check out ALG Defense, they have a nice simple handguard that is around $100. Or you could try your luck on ebay with some no name handguard for under $50 but I don't necessarily recommend that.

Here's the alg handguard I was talking about, http://www.redbarnarmory.com/ALG-Def...lgemrm-lok.htm
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