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Old September 14th, 2018, 08:52 PM #1
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Gas block port and gas tube port alignment

Can't find an answer on the net pertaining to my particular problem with port alignment. I have an Lr308 and when I put the gas tube in the block, the roll pin holes line up perfectly but the gas ports do not. About 85-90% of the gas tube's port is showing in the gas block. I tested this same gas block with 2 different tubes. Gas block out of spec?
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Old September 15th, 2018, 07:37 PM #2
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Anyone?
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Old September 15th, 2018, 07:41 PM #3
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I for one was a little confused reading this...to clarify, the hole that appears to be not lining up is one of the set screw holes at the bottom, is that correct?
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Old September 15th, 2018, 07:42 PM #4
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Can you post a better pic of the problem?
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Old September 15th, 2018, 07:46 PM #5
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Quote:
Originally Posted by 3paul10 View Post
I for one was a little confused reading this...to clarify, the hole that appears to be not lining up is one of the set screw holes at the bottom, is that correct?
Negative, that was the only way I was able to get that picture by looking down through the set screw hole. It's the gas tube inlet hole not lining up with the gas block's outlet hole if that makes any sense. The little bit of metal peeking in from the left is the gas tube inlet hole. I'm scared that gas is going to force its way out from in between the gas tube and gas block and cause cycling issues or worse.
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Old September 15th, 2018, 08:28 PM #6
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If that's the case, then either the gas block is out of spec, or the gas port was drilled in the wrong place. My guess is the gas block is out of spec...those gas blocks with 3 holes for set screws (which I think your is) are generally Chinese made....I'd get a good mil-spec gas block and try that. Hope that helps.

If that gas block and the gas port are not perfectly lined up, you can be assured you will have cycling issues....
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Old September 15th, 2018, 08:31 PM #7
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Thinking about this more...I'm still confused...you set the gas block , and the set screws go to the underneath of the barrel. Is there a dimple to the underside of the barrel throwing this off??
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Old September 15th, 2018, 08:36 PM #8
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I'm just going to get another gas block from somewhere local and bring both tubes with me to make sure everything lines up correctly. Thanks for the help though.
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Old September 15th, 2018, 08:38 PM #9
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I love mysteries.....do you have a carbine, midlegth or rifle gas tube?
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Old September 15th, 2018, 08:38 PM #10
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I think you will be fine. The hole in the gas tube and the gas block are a lot bigger than the gas port on the barrel. As long as the gas port on the barrel is completely covered, you should be fine. Also most rifles are over gassed, so it would still probably cycle fine.

I have an adjustable gas block and I can tune my gas down considerably and my rifle still cycles like a champ.
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