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Thread: Anyone have a high round-count with a factory BCM set screw gas block?

  1. #31
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    It's an ass ache to remove a BCM build gas block. There's no worries about them holding up.
    "You people have too much time on your hands." - scottryan

  2. #32
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    I saw in the MrGnG video above that there was a dimple for each set screw. I just did a rail swap and found only the rear one was dimpled. Upper was straight from BCM on s-i-l's rifle. His was a .750 instead of the .625, not sure if that's why the difference or not.

    FWIW, I used a heat gun to break loose the loc-tite. While I don't think it would have ever come loose on its own, it wasn't that difficult to remove. About 3k through this one, which ain't exactly high round count..............

  3. #33
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    Quote Originally Posted by RichinVA View Post
    I saw in the MrGnG video above that there was a dimple for each set screw. I just did a rail swap and found only the rear one was dimpled. Upper was straight from BCM on s-i-l's rifle. His was a .750 instead of the .625, not sure if that's why the difference or not.

    FWIW, I used a heat gun to break loose the loc-tite. While I don't think it would have ever come loose on its own, it wasn't that difficult to remove. About 3k through this one, which ain't exactly high round count..............
    I would guess that if someone wondered about both screws being dimpled (and without totally removing the gas block) you'd just have to look at them and one *should* sit out further than the other if only one was dimpled (?).
    11C2P '83-'87
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  4. #34
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    Quote Originally Posted by ABNAK View Post
    I would guess that if someone wondered about both screws being dimpled (and without totally removing the gas block) you'd just have to look at them and one *should* sit out further than the other if only one was dimpled (?).
    Concur, IF both screws are the same length.............they were on this one.

  5. #35
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    Quote Originally Posted by RichinVA View Post
    Concur, IF both screws are the same length.............they were on this one.
    So you could tell something was amiss just by looking at it right?
    11C2P '83-'87
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  6. #36
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    Quote Originally Posted by ABNAK View Post
    So you could tell something was amiss just by looking at it right?
    Don't think it was amiss, but different, yes.

  7. #37
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    I've removed a few BCM gas blocks and 1) they are always a PITA and 2) I don't recall ever seeing a barrel with more than a single dimple.
    Steve

  8. #38
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    Quote Originally Posted by SteveL View Post
    I've removed a few BCM gas blocks and 1) they are always a PITA and 2) I don't recall ever seeing a barrel with more than a single dimple.
    Interesting. Would seem to think that if you used two set screws that you'd dimple it twice!
    11C2P '83-'87
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  9. #39
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    Sorry if this comment is not related to BCM, but I've bought barrels that only had one dimple and I would make a second dimple. Not exactly sure why this is the case, but perhaps the dimple directly opposite of the GP is universal and the spacing to the second dimple is varied. For instance, I've seen some GB's that are .450" and I've seen some .400" (and maybe there are even more than that). But, at any rate, I would have thought the BCM product would have had two dimples.

    Quote Originally Posted by ABNAK View Post
    Interesting. Would seem to think that if you used two set screws that you'd dimple it twice!

  10. #40
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    Quote Originally Posted by tehpwnag3 View Post
    Sorry if this comment is not related to BCM, but I've bought barrels that only had one dimple and I would make a second dimple. Not exactly sure why this is the case, but perhaps the dimple directly opposite of the GP is universal and the spacing to the second dimple is varied. For instance, I've seen some GB's that are .450" and I've seen some .400" (and maybe there are even more than that). But, at any rate, I would have thought the BCM product would have had two dimples.
    Good point. While BCM likely doesn't make the barrels themselves they do know the spacing for the gas block they'll be using, so why not dimple both (especially if the barrel is already chucked up to do the first one).
    11C2P '83-'87
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