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Thread: Crack in my new lower (pics)

  1. #11
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    Who ever started the rumor that it's ok to install roll pins with Vise Grips or Vise Grip clones needs to be taken out behind the work shop and have things explained to his knee caps

    Examine the defect with a 10x magnifying glass and a strong light
    Last edited by MistWolf; 10-02-12 at 10:31.
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  2. #12
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    Quote Originally Posted by Iraqgunz View Post
    Are you sure the lower wasn't out of spec? I have seen it more than once.
    There's a good chance of that.

    It just seemed ironic that two people were having similar problems with the bolt catch using the same LPK. Given that a different lower fixed the problem, it'd be safe to say it was most likely a problem associated with the lower.

  3. #13
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    Quote Originally Posted by MistWolf View Post
    Who ever started the rumor that it's ok to install roll pins with Vise Grips or Vise Grip clones needs to be taken out behind the work shop and have things explained to his knee caps

    Examine the defect with a 10x magnifying glass and a strong light
    Most likely a candy ass afraid of scratching his lower.


  4. #14
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    Quote Originally Posted by Iraqgunz View Post
    A few observations.

    This happens quite bit when using the wrong technique and tools.
    Did you see that he's talking about the Bolt stop and not the trigger guard?
    "You people have too much time on your hands." - scottryan

  5. #15
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    It does look like a minor crack from the pictures you provided. It looks to me more cosmetic and doesn't look particularly deep. As long as you have full functionality of your bolt stop, I would just drive on and learn for future builds.

  6. #16
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    IG, look at his pics, not the trigger guard but the Bolt Catch.

    Quote Originally Posted by Iraqgunz View Post
    A few observations.

    This happens quite bit when using the wrong technique and tools.

    1. Lube your pins before installing.

    2. Using the correct punches (starters followed by roll pin punches).

    3. I highly recommend getting a Magpul trigger guard and putting it in between the ears when starting your roll pin. It will help when starting the pin. Or you can get a piece of solid plastic or Delrin and make something to insert in between.

    4. Use a nylon/brass hammer. Tap the pin until it is flush and then place the trigger guard of your choice in the right position and finish driving through. I use the starter punch until it almost hits the receiver. Then use your roll pin punch.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  7. #17
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    I agree, this looks like a forging burr and not an actual crack.


    Quote Originally Posted by Texas_Mike View Post
    You should be fine. The crack didn't completely penetrate the tab, or else it would have come off and moved in the direction the pin was being driven in. In addition, the force that was applied while driving in the pin is much greater than any forces that will be applied during normal operation of the rifle. Even when the bolt is locked open once a magazine is emptied during live fire, the majority of the catch's surface area is pushed forward by the bolt and rests flush in the recess. This will prevent any excessive force from being exerted on just the tab alone. Even hitting the paddle with the palm of your hand to release the bolt should not be an issue. At this point, it is strictly cosmetic.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  8. #18
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    Quote Originally Posted by MistWolf View Post
    Who ever started the rumor that it's ok to install roll pins with Vise Grips or Vise Grip clones needs to be taken out behind the work shop and have things explained to his knee caps

    Examine the defect with a 10x magnifying glass and a strong light
    Lol that's How I do it with channel locks and tape

    To me it looks like a tear Its not critical and could be ground out a little and welded by the right guy if needed.
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  9. #19
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    My bad I didn't see the pics cause I couldn't bring him up on my phone for some reason when I saw ear I was thinking trigger guard automatically.



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  10. #20
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    I blew up the last pic and I also believe that its a forging flaw. What you are calling a crack appears to be annodized and there is no silver visible. Shoot it. If it ever does break turn it into a .22
    "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin

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