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Posted: 10/25/2004 8:59:29 AM EST
Just starting to learn about AR's, what is a gas block and what does it do? Going to build a AR for predator hunting only and plan on long shots, do I need a glass block?
Link Posted: 10/25/2004 9:34:46 AM EST
The gas block is the interface between the barrel and the gas system. In most AR-15s it's also the front sight.
Link Posted: 10/25/2004 9:50:16 AM EST

Originally Posted By CJL:
Just starting to learn about AR's, what is a gas block and what does it do? Going to build a AR for predator hunting only and plan on long shots, do I need a glass block?hr


A good place to START learning about AR's is right here---->www.ar15.com/content/manuals/
Link Posted: 10/25/2004 9:55:00 AM EST
the gas block prevents wear-n-tear on the charging handle.
Link Posted: 10/25/2004 9:56:32 AM EST

Originally Posted By M4Kid:
the gas block prevents wear-n-tear on the charging handle. hr


Kid, the guy needs help.. don't confuse him.
Link Posted: 10/25/2004 10:06:05 AM EST
On the top of the barrel there is a small hole. A gas block is mounted over this hole (usually incorporated into the front sight, but not always). A 'gas tube' is affixed to this gas block and runs back into the upper receiver and end at the 'gas key' which is affixed to the top of the bolt carrier.

When a round is fired, the explosive gases from the round travel down the barrel, up this hole into the gas block, down the gas tube and use the gas key to push back the bolt carrier assembly, which cycles another round into the chamber.
Link Posted: 10/25/2004 10:46:48 AM EST
So with a complete upper the gas block is supplied?
Link Posted: 10/25/2004 10:53:28 AM EST

Originally Posted By CJL:
So with a complete upper the gas block is supplied?



Should be and in most cases it is.................But never assume. Learn as much as you can about the rifle................
Link Posted: 10/25/2004 5:23:22 PM EST

Originally Posted By CJL:
So with a complete upper the gas block is supplied?


YES. It must be or the upper would not function. Like I said 99% of the time the 'gas block' is the Front Sight base (it has multiple functions).
Link Posted: 10/25/2004 6:44:16 PM EST
Yes, it SHOULD be included in a complete upper, but always double check just to make sure.
Link Posted: 10/25/2004 7:44:59 PM EST
[Last Edit: 10/25/2004 7:45:38 PM EST by SNorman]
Make sure to install the gas block or else hot gasses will escape into the barrel and cause functioning problems, not to mention leaking gas coming back in your face (since they're not getting "blocked"). Also make sure to stock up on gas block fluid.

Link Posted: 10/25/2004 8:37:26 PM EST
make sure that the gas block comes with a bayonet lug... these are very important and your AR will not function properly without it.
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