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Thread: gas block troubles...

  1. #11
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    That screw isn't enough to hold the block in place. I had this on my .223 pistol upper and it walked even with the dimple so I drilled the front strap of the block for a taper pin and had planned to install another in the rear when the front one had been set. Now I've sold that barrel and have switched to a 300blk and will be doing pins on it.

    The screw is simply too small to do anything effective. Someone had a "great idea" that didn't work in reality. A 3/16" roll pin is cheap insurance. I happen to have a tapered endmill that fits my taper pins, so I use those. If I didn't, I'd use a roll pin if it might be a mission critical gun.

    I'll be working on that upper in a bit, I can take pics of the FSB then.

  2. #12
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    With the other spot in there (closer to the upper), it almost looks like they intended to have two screws at first.


  3. #13
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    Quote Originally Posted by FJ540MN View Post
    With the other spot in there (closer to the upper), it almost looks like they intended to have two screws
    Yeah that would never work for the long haul. Better to send it to ADCO and have it pinned for $90, or as a distant second choice, replace that FSB with a clamp-on for $45.

    http://www.armalite.com/ItemForm.aspx?item=EU0240MPKIT

  4. #14
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    $90 just to pin the thing on? Sheesh. Highway robbery.

  5. #15
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    Quote Originally Posted by FJ540MN View Post
    $90 just to pin the thing on? Sheesh. Highway robbery.
    That's at ADCO, so he'd have to add the cost of shipping both ways. IMHO drilling and pinning it with taper pins would be the most secure way, but others have said that clamp-on FSBs are an acceptable alternative. Probably cheaper at a local gunsmith as long as that gunsmith has the proper jigs to get the FSB aligned perfectly. The clamp-on version would be pretty easy to install, but it would require that the muzzle device be removed. That's easy enough unless it's pinned and welded.
    Last edited by Hmac; 02-11-13 at 07:54.

  6. #16
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    I just taper drilled mine last night without anything but a bubble level and a vise. It's not rocket surgery.

  7. #17
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    Quote Originally Posted by FJ540MN View Post
    I just taper drilled mine last night without anything but a bubble level and a vise. It's not rocket surgery.
    Cool. I'm gonna keep that in mind and get in touch with you next time I need to install an FSB.

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