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So I took the A2 sight post off of a PSA upper.

Discussion in 'Rifle Country' started by ezypikns, Jun 13, 2015.

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  1. ezypikns

    ezypikns Member

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    And now I'm installing a YHM rail type gas block. Small problem. The gas block roll pin (and the roll pin hole in the gas block tube) are smaller than the hole in the YHM gas block.

    Any suggestions?
     
    Last edited: Jun 13, 2015
  2. wally

    wally Member

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    You need the correct roll pin for the gas block, then you can drill the gas tube if necessary, may be easier to replace the gas tube.

    But I thought the gas tube roll pins, and thus the holes for them in the gas block were standardized. I've swapped out a fair number and never ran into this issue.


    Does your YHM gas block mount with set screws or the original taper pins?

    I'd contact YHM, they may have drilled the hole too big.
     
  3. MistWolf

    MistWolf Member

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    Shave the FSB and reinstall it
     
  4. Mike C2

    Mike C2 Member

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    I've got YHM folding front sight bases on a couple of guns that I pulled the A2 base off. And they used same tube and pin that came off, so I think calling YHM as mentioned above is best advice.
     
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