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Posted: 1/23/2012 11:11:42 AM EDT
| Bought my first AR used. I know very minimal about ARs but it is a Colt Match Target Competition HBAR with some mods done by the previous owner. One of wich is a low profile gas block. After shooting the rifle with much success the first couple of trips to the range, the rifle started to short cycle. The ejections were obviously weak and it would fail to feed. That is when I noticed that the gas block had small gap between it and the ridge on the barrell that appears to be the stopping point for installing the gas block. It seem to me that this would definately be a problem since the hole in the barrell and the hole in the gas block were not alligned. Right?? Well then I noticed that the gas block was missing one of the set screws and the other was loose. So I want to remove the gas block to take it with me to make it easier to get a new set screw for it. And I fugured it's a good time to clean the gas tube and such. I thought gas blocks slid right off once the set screws were removed. Mine does not. I need to know if this is normal and how to get it off without damaging the gun. I do not have any specialized tools so home remedies are welcome. Also, there is not a gas tube retention pin in this gas block. Seems kinda wierd. Is the gas tube just pressed into the gas block? This might seem pretty basic, but i'm learning as i go and don't want to damage anything. Thanks for any help. |
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There is a cap between the FSB and the shoulder when using standard handguards.
Unless the gas block was designed to fit without the cap then that gap needs to be there to properly align the gas port with the hole in the gas block. Some gas blocks are put on tight, I don’t know if it is deliberate on a Colt or not. Look for powder residue around the gas block and bolt carrier key. Also check the key to see if it is loose. Check the gas rings on the bolt. Lack of proper lubrication can also cause short stoking and is the #1 problem I usually see at the range. It seems unlikely the gas tube would not be pinned. If the pin came out and the tube shifted it could partially block gas flow. |
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Quoted:
Can't seem to post my pics. Any help Here is a how-to. http://www.ar15.com/archive/topic.html?b=1&f=5&t=876558 |
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Here are the links to the pics
http://i1249.photobucket.com/albums/hh512/jeephed/2012-01-23_19-02-38_180.jpg http://i1249.photobucket.com/albums/hh512/jeephed/2012-01-23_19-03-29_273.jpghttp://i1249.photobucket.com/albums/hh512/jeephed/2012-01-23_19-03-29_273.jpghttp://i1249.photobucket.com/albums/hh512/jeephed/2012-01-23_19-02-38_180.jpg |
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I would still opt for the plastic or hard rubber first, but brass should be ok.
They could have pressed and used Loctite to secure the gas tube. Replacing that tube could be a real adventure. I would call Colt’s service department and see what they will tell you. |
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