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Thread: Secure your gas block, please...

  1. #31
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    Quote Originally Posted by Hmac View Post
    I'm confident that those pins on either my Noveske gas blocks or my Geissele gas blocks represent less intrusion into my barrel than any taper-pinned FSB.
    A badly taper pinned FSB can definitely be a barrel rape job. A correct (50% diameter ream) taper job is my preference. Noveske pins always struck me as minimally invasive. The Geissele is just un-nerving to me.

    I think all of the pin options are plenty strong enough. I just like the least amount of barrel removed possible.
    "You people have too much time on your hands." - scottryan

  2. #32
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    I will just go ahead and say it. Some of the comments here are asinine. Several companies mentioned such as BCM, SIONICS and SOLGW use low pro gas blocks with set screws. Barrels are dimpled and red Loctite is used. I have yet to see a properly assembled barre/low pro set up come loose. The ones I have were substandard pieces of shit, with non-dimpled barrels, crappy set screws and no Loctite. We have multiple demo guns with thousands and thousands of rounds through them that are a non-issue.



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  3. #33
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    Everyone that I have seen loosen was due to exactly the reasons you stated.

    Quote Originally Posted by MQ105 View Post
    This is a PSA: Ensure your gas block is properly secured! This means, either pinned, or a dimple for a set screw plus thread locker.

    I was able to attend a carbine class this past weekend (thank you Jim Carter, et al) and there were two gun problems. One was a low-pro gas block that worked forward enough to make the gun a single-shot. This was near the end of day one, and after several thousand rounds through the gun prior to this class. This gun was purchased fully assembled, not home-grown. (Not that home-built is bad; just FYI)
    There was no pin and no set screw dimple. In this case, it was a minor inconvenience because we were on the range. A backup gun allowed the shooter to keep learning, and we fixed the problem that night.
    It got several other shooters wondering about their gas block situation. After a quick look at three guns, we found two others in the same condition (no pin/dimple. Neither GB had moved.)

    So, how reliable does your rifle/carbine need to be? Just sayin'...



    Owner/Instructor at Semper Paratus Arms

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  4. #34
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    Quote Originally Posted by Iraqgunz View Post
    Everyone that I have seen loosen was due to exactly the reasons you stated.
    So you’ve seen set-screw gas blocks loosen. Have you seen many pinned gas blocks loosen?



    ..
    Last edited by Hmac; 03-09-18 at 04:13.

  5. #35
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    Yes. ones that were not properly installed. As to the pinned ones, it's irrelevant.

    Quote Originally Posted by Hmac View Post
    So you’ve seen set-screw gas blocks loosen. Have you seen many pinned gas blocks loosen?



    ..



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  6. #36
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    Quote Originally Posted by Hmac View Post
    So you’ve seen set-screw gas blocks loosen. Have you seen many pinned gas blocks loosen?



    ..
    Its not pinned vs set screw, its friction vs something that protrudes into the barrel to prevent foreward movement or rotational movement on the barrel. The friction(pin) or locktite(setscrew) is the secondary hold. Either system you Have two layers when done properly. The ones that fail merely are held on with friction. A set screw without dimples and loctite would be like using a rollpin without a cutout in the barrel. I would imagine that would also fail under hard use.

  7. #37
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    Correct me if I'm wrong, but the MK12s were all built using a low profile gas block held in place by set screws. It is known that the dimples on the Douglas barrel only line up with the rear most set screw of the gas block. So in essence you only have one dimple/set screw holding the gas block in place anyway. If I'm not mistaken the MK18s were also built using low profile gas blocks with set screws, and those are the tacticool fanboy halo guns.

  8. #38
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    You can stake the set screws.
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

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  9. #39
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    Quote Originally Posted by Iraqgunz View Post
    I will just go ahead and say it. Some of the comments here are asinine. Several companies mentioned such as BCM, SIONICS and SOLGW use low pro gas blocks with set screws. Barrels are dimpled and red Loctite is used. I have yet to see a properly assembled barre/low pro set up come loose. The ones I have were substandard pieces of shit, with non-dimpled barrels, crappy set screws and no Loctite. We have multiple demo guns with thousands and thousands of rounds through them that are a non-issue.
    This man knows, I trust him. But in case you need a you-tube certified armor to believe:

    1.) dimpled barrel, (only one dimple under gas-port/ rear set-screw required)
    2.) Knurled-tip, cup-point set-screws
    3.) Prep surface of threads of screw and gas block with acetone to remove all oils and debris
    4.) red loctite 272 or equivalent
    5.) 25 INCH-pounds of torque, do the rear first then front

    Done.

  10. #40
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    Quote Originally Posted by Iraqgunz View Post
    I will just go ahead and say it. Some of the comments here are asinine. Several companies mentioned such as BCM, SIONICS and SOLGW use low pro gas blocks with set screws. Barrels are dimpled and red Loctite is used. I have yet to see a properly assembled barre/low pro set up come loose. The ones I have were substandard pieces of shit, with non-dimpled barrels, crappy set screws and no Loctite. We have multiple demo guns with thousands and thousands of rounds through them that are a non-issue.
    What's your opinion on Rocksett vs Red Loctite for dimpled set-screw jobs? The recent Rocksett thread made a good argument for using it vs Red Loctite, higher temp resistance plus easier to remove if needed.

    And what about wicking Green Loctite? Wouldn't its wicking ability also chemically secure the entire gas block to the barrel making it a very strong attachment method?

    Pros and cons of Rocksett vs Red vs Green Loctite for dimpled set-screw gas blocks? Temperature resistance, strength, ease of removal if needed? Would love to hear opinions from the professionals here.

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