GUN AR sight question

Discussion in 'On Topic' started by Fire Sauce, Sep 10, 2009.

  1. Fire Sauce

    Fire Sauce New Member

    Dec 21, 2003
    Likes Received:
    Hilton Head Island, SC
    I currently have an A3 upper and was considering swapping the barrel assembly onto an A1 upper. The FSB isn't F-marked, but I didn't have any problems sighting it in with the carry handle. If I swap the barrel assembly onto an A1 upper, am I going to have problems getting the front sight to adjust to the right height?
  2. If it's not F marked it should work fine with the A1 upper, as that's how it was intended originally. You were lucky to find that the A3 upper worked with the non-F FSB you have, unless there's a taller than standard post in there. If the post is taller than standard, you can either adjust it down further to work with the A1 or you can get a standard post. The post is the only real variable though, as the non-F FSB and A1 should work perfectly together. The best thing to do would be to assemble it and try to zero it, and if needed get a shorter post.

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