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Thread: Removing FSB problem

  1. #31
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    Quote Originally Posted by jmp45 View Post
    Would the taper pins appear to be longer in a .625 sight block? My pins back in are flush left side, right side out 1/16 to 3/32 or so. Just need to know if they are in far enough.
    When they won't go in any further, they are far enough. The taper will only allow them to go so far.

  2. #32
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    I think the forgings are the same, the ID is the only difference. I try to make a note of where they were originally and shoot for that. If you don't put the pins back in the same holes (necessity of this is debatable) they may not seat the same. I would go out and check your zero, you may find that after you get the barrel hot once, you can knock the pins in a little deeper (once the barrel is cool, of course). Ideally, I like to see equal amounts of pin on both sides.

    Quote Originally Posted by jmp45 View Post
    Would the taper pins appear to be longer in a .625 sight block? My pins back in are flush left side, right side out 1/16 to 3/32 or so. Just need to know if they are in far enough.
    B.A.S. Mechanical Engineering Technology

  3. #33
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    Thanks Guys, I didn't take the pins out so I'm not sure the original position. I shaved the FSB so zero won't be an issue. I'm going to sledge them in with a concave nail set on rock maple block. Won't ever need to remove them so I'll try to get them exposed on the left side, maybe 50/50 left/right if I can get it.

  4. #34
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    Quote Originally Posted by jmp45 View Post
    Thanks Guys, I didn't take the pins out so I'm not sure the original position. I shaved the FSB so zero won't be an issue. I'm going to sledge them in with a concave nail set on rock maple block. Won't ever need to remove them so I'll try to get them exposed on the left side, maybe 50/50 left/right if I can get it.
    Shouldn't take that much force. Once lined up you can put them in a good portion of the way by hand. Then maybe a light tap or two with a small hammer and finish with a tap or two via the punch.

    I removed with a 3lb sledge, but used a regular hammer and punch to reseat them. Worth double checking them after a range trip as Eric D. suggests.
    Last edited by txbonds; 03-20-13 at 14:50.

  5. #35
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    Quote Originally Posted by txbonds View Post
    Shouldn't take that much force. Once lined up you can put them in a good portion of the way by hand. Then maybe a light tap or two with a small hammer and finish with a tap or two via the punch.

    I removed with a 3lb sledge, but used a regular hammer and punch to reseat them. Worth double checking them after a range trip as Eric D. suggests.
    I'll try with a 16 oz first. I used a 1lb dead blow but maybe the plastic block on the bench had too much give.

  6. #36
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    So I'd know my allignment is off if I have to zero with extreme windage adjustments? On my other BCM with the same type of rear sight, but with a DD fixed front sight, I had to adjust the windage only a a few MOA at 100 yards for the zero.
    Last edited by Zane1844; 03-20-13 at 15:10.

  7. #37
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    I tried to set the pins farther with a 16 oz hammer, no movement, slight mushrooming. Moved on the 4 lb sledge. No movement and more mushrooming. Guess it's safe to say, they are set..

  8. #38
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    Although it would bug me to have extreme left/right windage adjustments, if you can zero you are good to go. Unless the pins or holes get damaged I wouldn't expect alignment to change much. Maybe +/-1/2 moa for your windage adjustment, if that.

    Quote Originally Posted by Zane1844 View Post
    So I'd know my allignment is off if I have to zero with extreme windage adjustments? On my other BCM with the same type of rear sight, but with a DD fixed front sight, I had to adjust the windage only a a few MOA at 100 yards for the zero.
    B.A.S. Mechanical Engineering Technology

  9. #39
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    Quote Originally Posted by Eric D. View Post
    Although it would bug me to have extreme left/right windage adjustments, if you can zero you are good to go. Unless the pins or holes get damaged I wouldn't expect alignment to change much. Maybe +/-1/2 moa for your windage adjustment, if that.
    This is why I was asking about using a jig for alignment. When you are putting the pins in, there is a good bit of play around the barrel to where you can get the pins to go in even though the FSB might not be perfectly aligned. Take an example where it is slightly off, the pins are put in, and then driven home with a hammer/punch. Will the FSB auto correct to the original alignment, or will the pins now create a new slightly canted orientation for the FSB.

  10. #40
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    Well the gunsmith could not remove it himself so he will try when his brother comes back from lunch.

    He said he can use his press to get them out if the hammer does not work, then if the press does not work out then he can drill the top of the pins out and get them out.

    He says that the pins can be replaced but not the front sight. Can pins be replaced or are they mated with barrel and sight?

    He seems very preofessional, however. Though I am not sure if their complete expertise is in AR's.
    Last edited by Zane1844; 03-20-13 at 16:19.

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