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Posted: 2/4/2020 1:03:25 AM EDT
[#1]
So let me get this straight. You removed the GB to clean underneath it?
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Posted: 2/4/2020 1:06:13 AM EDT
[#2]
Correct. And to get into the gas tube entrance into the upper receiver.
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Posted: 2/4/2020 1:09:26 AM EDT
[#3]
It's most likely not "damage". Typically, those "dimples" are drilled as a part of the process of installing a screw-secured gas block. If they weren't there, your gas block might walk off in a few hundred rounds due to shock and heating/cooling cycles. The physical intrusion of the set-screws into the barrel surface gives them mechanical advantage to hold things in place properly.
They present no issues for safety or, realistically, accuracy, any more than threads on a barrel end would pose a safety or accuracy issue. |
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Posted: 2/4/2020 2:00:42 AM EDT
[#4]
One is a dimple and the other is where the set screw bit into the barrel to make sure it held fast. It is supposed to be like that.
You *really* don't need to pull that all apart like that. Gas blocks don't need to come off unless it's a barrel or handguard change. |
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Posted: 2/4/2020 7:19:07 AM EDT
[#5]
Only thing is, those dimples weren't there before I installed the gas block. So I'm wondering if they came about due to me being too tight on the screws during install (I used an allen key until I couldn't turn anymore with reasonable pressure). So they are from the screws. I'm hoping like you said, it's simply just a natural process when you have a screwed on gas block. Thanks for your reply. Have you seen this on any of your rifles/pistols?
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Posted: 2/4/2020 7:20:05 AM EDT
[#6]
So this just happens typically with screw-on gas blocks? I'm only asking because it wasn't there originally. Thanks.
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Posted: 2/4/2020 7:27:32 AM EDT
[#7]
Quoted:
Only thing is, those dimples weren't there before I installed the gas block. So I'm wondering if they came about due to me being too tight on the screws during install (I used an allen key until I couldn't turn anymore with reasonable pressure). So they are from the screws. I'm hoping like you said, it's simply just a natural process when you have a screwed on gas block. Thanks for your reply. Have you seen this on any of your rifles/pistols? Quoted:
So this just happens typically with screw-on gas blocks? I'm only asking because it wasn't there originally. Thanks. |
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Posted: 2/4/2020 7:31:48 AM EDT
[#8]
Ok that's relieving. Thanks all for your input.
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Posted: 2/4/2020 8:19:44 AM EDT
[#9]
If the marks bother you there are clamp on gas blocks available that don't mar the barrel.
 Attached File |
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Posted: 2/4/2020 9:00:55 AM EDT
[#10]
Quote HistoryQuoted:
So this just happens typically with screw-on gas blocks? I'm only asking because it wasn't there originally. Thanks. Also, there’s no need to completely tear down your rifle after it gets wet. |
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Posted: 2/4/2020 9:06:13 AM EDT
[#11]
Quote HistoryQuoted:
One is a dimple and the other is where the set screw bit into the barrel to make sure it held fast. It is supposed to be like that. You *really* don't need to pull that all apart like that. Gas blocks don't need to come off unless it's a barrel or handguard change. |
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Posted: 2/4/2020 9:37:50 AM EDT
[#12]
Quote HistoryQuoted:
This. Quote HistoryQuoted:
Quoted:
One is a dimple and the other is where the set screw bit into the barrel to make sure it held fast. It is supposed to be like that. You *really* don't need to pull that all apart like that. Gas blocks don't need to come off unless it's a barrel or handguard change. |
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Posted: 2/4/2020 10:13:40 AM EDT
[#13]
Quote HistoryQuoted: Double this, And that little mark from the non dimpled hole is has absolutely no bearing integrity of the barrel. If it did Military type FSP barrels would be failing left and right from the fact that there is 2 drilled out sections for pins.  Attached File |
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