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Thread: Removing FSB problem

  1. #21
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    Out of curiosity, what are you guys doing to make sure the FSB is held in alignment when you put the pins back in?

    I realize if you are shaving the FSB down it doesn't matter so much, and to a certain extent the pins themselves will tend to align the FSB, but to guarantee absolute center and alignment what are you doing?


    Didn't know if you are using a jig of some sort or what. Just curious.

  2. #22
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    Talked to the gunsmith in my area he said that he will try to get them out on the spot whenever I walk in. Though he said since I tried to beat them to death, they may be damaged and require machining of the sight.

    First, those things are steel so I doubt they are mushroomed to the point of no return, they do not look it either. Also, I worry about the gas tube, as he will give me a free FSB to replace the old one. Apparently removing those are a common occurrence for him. Though I have to know if he has .625 ones.

    Anyone damage BCM pins from hammering them? Just thinking though, do the sights not have to be reamed with the barrel? How would replacing work?
    Last edited by Zane1844; 03-20-13 at 13:32.

  3. #23
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    Quote Originally Posted by eodinert View Post
    I use a big fat punch to get them started...not sure what size. It's about 1/4 inch in diameter, all the way to the tip. Once they move, even just a little.. I switch to a smaller punch.

    The important thing is to make sure the front sight base is supported while you're whacking on it.
    This is exactly how I got mine to move. The pins can be slightly mushroomed and you just need to "break" that edge to get the pin moving. The first punch I used was probably double the diameter of the pin. And while firmly supported by a wood block, I hit it pretty hard with a small sledge hammer. Once they break loose the pins will move with a proper sized punch.
    Last edited by MacA; 03-20-13 at 16:19.
    Mark
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  4. #24
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    Quote Originally Posted by Zane1844 View Post
    Talked to the gunsmith in my area he said that he will try to get them out on the spot whenever I walk in. Though he said since I tried to beat them to death, they may be damaged and require machining of the sight.

    First, those things are steel so I doubt they are mushroomed to the point of no return, they do not look it either. Also, I worry about the gas tube, as he will give me a free FSB to replace the old one. Apparently removing those are a common occurrence for him. Though I have to know if he has .625 ones.

    Anyone damage BCM pins from hammering them? Just thinking though, do the sights not have to be reamed with the barrel? How would replacing work?

    The FSB was drilled and reamed in place on that barrel using a jig to align and hold it in position. Not sure if BCM does that in house or if it's outsourced, but they are using jigs to put them together that are guaranteeing proper position and hence sight accuracy. That's why I was asking how you planned to realign it when hammering new pins back in place.
    Last edited by txbonds; 03-20-13 at 13:53.

  5. #25
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    Quote Originally Posted by txbonds View Post
    The FSB was drilled and reamed in place on that barrel using a jig to align and hold it in position. Not sure if BCM does that in house or if it's outsourced, but they are using jigs to put them together that are guaranteeing proper position and hence sight accuracy. That's why I was asking how you planned to realign it when hammering new pins back in place.
    Watching the youtube videos, the ITS Tactical one specifically, he just said if the pins line up perfectly then the sight is aligned.

  6. #26
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    Quote Originally Posted by Zane1844 View Post
    Watching the youtube videos, the ITS Tactical one specifically, he just said if the pins line up perfectly then the sight is aligned.
    Okay, I guess it could be that simple, don't know. When I removed mine it was to shave it and once done it didn't matter as much. Since I've only unpinned/pinned low profile blocks, so I wasn't really sure how people go about guaranteeing the alignment. Cheers.

  7. #27
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    Quote Originally Posted by txbonds View Post
    Okay, I guess it could be that simple, don't know. When I removed mine it was to shave it and once done it didn't matter as much. Since I've only unpinned/pinned low profile blocks, so I wasn't really sure how people go about guaranteeing the alignment. Cheers.
    Yeah, I was considering making lines and have them match up. Idk, hopefully Iraqguns can help with this.

    Though, I am wondering if the gunsmith dude will just give it one whack, and if they do not budge say it has to be machined off.. guess it would be up to me.

  8. #28
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    BCM pins are high quality, hardened steel. Good pins shouldn't mushroom so I don't think that will be an issue. I'm not sure why your smith offered you a new fsb as he would have a helluva time aligning it with the original holes

    There's nothing to worry about when reinstalling the pins either, they are self aligning. You also don't need to hammer them too hard, there was a thread awhile back where a guy split his fsb from beating the pins too much. Just visibly align the holes, push the pins in by hand, give them a few light taps with a smaller hammer (I still say an 8oz ball peen is all you need for any taper pin job), then grab a punch and seat them.

    Quote Originally Posted by Zane1844 View Post
    Talked to the gunsmith in my area he said that he will try to get them out on the spot whenever I walk in. Though he said since I tried to beat them to death, they may be damaged and require machining of the sight.

    First, those things are steel so I doubt they are mushroomed to the point of no return, they do not look it either. Also, I worry about the gas tube, as he will give me a free FSB to replace the old one. Apparently removing those are a common occurrence for him. Though I have to know if he has .625 ones.

    Anyone damage BCM pins from hammering them? Just thinking though, do the sights not have to be reamed with the barrel? How would replacing work?
    Last edited by Eric D.; 03-20-13 at 14:09.
    B.A.S. Mechanical Engineering Technology

  9. #29
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    Quote Originally Posted by Eric D. View Post
    BCM pins are high quality, hardened steel. Good pins shouldn't mushroom so I don't think that will be an issue. I'm not sure why your smith offered you a new fsb as he would have a helluva time aligning it with the original holes

    There's nothing to worry about when reinstalling the pins either, they are self aligning. You also don't need to hammer them too hard, there was a thread awhile back where a guy split his fsb from beating the pins too much. Just visibly align the holes, push the pins in by hand, give them a few light taps with a smaller hammer (I still say an 8oz ball peen is all you need for any taper pin job), then grab a punch and seat them.
    Thanks man, you helped a lot!

  10. #30
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    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.

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