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Old 03-04-2013, 21:50   #1
cliffsta
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Colt gas tube diameter?

Done a LOT of searching on the web and can't find an answer.

I wanna buy a YHM gas block with flip-up sight since I"ll be springing for an optic soon. The YHM gas block has a .750 bore diameter for the gas tube. Is this the standard size gas tube for all carbine-length ARs? Specifically my 6920.

I just don't wanna go through the hassle of ordering an expensive part to get it home and find out its the wrong size.

Thanks in advance.
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Old 03-04-2013, 22:29   #2
Atomic Punk
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i think the .750 bore diameter is referring to the outside diameter of your barrel, not anything to do with the hole for the gas tube.
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Old 03-04-2013, 22:49   #3
m2hmghb
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The .750 is the size of the barrel it will fit. I believe there are two other sizes, one a .625 and the bull barrel at .936.
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Old 03-05-2013, 02:03   #4
mvician
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The .750" YHM flip/gasblock will fit your 6920 barrel.
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Old 03-05-2013, 04:59   #5
faawrenchbndr
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Gas tube diameters are standardized. Barrel diameter is the concern as others stated above.
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Old 03-05-2013, 11:07   #6
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Oh okay. I was clearly confusedx10

Thanks for answering this question guys.
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Old 03-05-2013, 14:16   #7
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You'll like it. I just put one on mine and it works and looks great.
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