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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 06-04-2010, 7:27 PM
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gemini1 gemini1 is offline
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Default 16" middy gas port hole size

Anyone know what the size of the gas port hole is on a 16" mid lenght upper? Is it standard for all brands?

TIA
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  #2  
Old 06-05-2010, 8:04 AM
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Marlin Hunter Marlin Hunter is offline
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Default

It is larger for the shorter barrel.

The most common reason why an shorty AR will not cycle is a plugged gas port.

I did a search and found this

For 5.56mm
Colt's gas port sizes are:
* 10.5" - .093
* 11.5" - .081
* 14.5" - .063
* 16" - .063
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Old 06-06-2010, 8:29 AM
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Quote:
Originally Posted by Marlin Hunter View Post
I did a search and found this

For 5.56mm
Colt's gas port sizes are:
* 10.5" - .093
* 11.5" - .081
* 14.5" - .063
* 16" - .063
Those are carbine gas port sizes and they are also incorrect for optimum function.
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