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Thread: Removing FSB problem

  1. #11
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    Try spraying some P-B penetrating oil on them give it a day to soak in if you can, you can buy it in a spray can at auto-zone etc. keep spraying it and let it soak in. but give it time to do its job, this wont happen in 10 min. P-B is not WD-40 i used it a lot in my shop.

  2. #12
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    Thanks for all the help.

    Also, will I need a new crush washer? because the FH tightened hand tight to where its suppose to be.

  3. #13
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    You should replace the crush washer any time the FH comes off.
    B.A.S. Mechanical Engineering Technology

  4. #14
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    Quote Originally Posted by Zane1844 View Post
    When my brother gets home I will ask for his assistance. And I will give a couple good hits, if they do not budge, I do not know, I will try a bigger hammer.
    I used a small sledge but not sure of its weight.

  5. #15
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    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.

  6. #16
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    Got any freon or dustoff? Fastest way I know to get taper pins loose is to freeze them then hit them with a 4 pound maul. You can stick the upper in your freezer for about 30 min and get similar results.

    The PB penetrating oil is sometimes a good idea too.

    I personally use a heavy aluminum pin block because the polymer ones or wood, like you're using is to resilient.
    Quote Originally Posted by markm View Post
    But you should have enough mags that you don't need to see a grief councelor if you destroy or damage one.

  7. #17
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    This is how BCM does it:

    From speaking with customers, it seems BCM FSB taper pins are harder to remove than some others. When we do it here, we can knock the pins free in under 60 seconds.
    Here are some basic pointers on the way we remove them.

    1) It takes Two. You will need a buddy to hold the upper group stable as you pound out the pins. You will not be able to get a good concentrated force on the pins if the upper is wobbling around (even a little bit).

    2) Action Jackson. You will need a couple of action blocks (see Brownells for a good selection). These will be great platforms to stabilize the barrel. Also get the Brownells FSB block. You may have to mod the shape of the FSB block if using a free float.

    3) Installed from starboard side. Milspec FSB are drill and the reamed for taper pins. The reamer runs from the right to the left (pointing the muzzle at the bad guy). So BCM pins need to be removed from left to right. Cannot be done the opposite way.

    4) Secure that carbine. Using action blocks and the buddy system secure the upper group so the left side is facing up.

    5) Get a fat one. We do not use those small radius head punches to break the pins free. We use a much fatter punch (5/16”). It’s a meaty sucker. Lots to hang on to, and enables you to put some force on the hammer. Using a 5/16” punch and a 12oz hammer, give her a smack. Anywhere between 1 and 6 smacks, and the pin moves. All you want to do is to get it to move to about flush.

    6) Grab a skinny one. Now get the tiny little 1/8” punch to push the pins out of the FSB. They are already broken free, this just drives the fully out. Tap, tap, tap.

    7) Celebrate. You are done. Do the banana dance.


    Hope this info helps...
    Thanks!
    Paul BCM
    Last edited by shootis; 03-20-13 at 06:27.

  8. #18
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    I'm having issues replacing the taper pins with a bcm fsb. I beat the heck out of them going right to left. The will only to the point of being flush on the left side. Right side they extend maybe a 1/16" or little more. Will that be a problem or do I need a bigger hammer?

  9. #19
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    Quote Originally Posted by jmp45 View Post
    I'm having issues replacing the taper pins with a bcm fsb. I beat the heck out of them going right to left. The will only to the point of being flush on the left side. Right side they extend maybe a 1/16" or little more. Will that be a problem or do I need a bigger hammer?
    Oh no, so I have hell to go through getting them back in?

    If its any help it appears that they are sticking out farther on the right side on mine, though, rest assured, it is not because I moved them

    Also, can I use the same pins to put the FSB back on? I am already in need of a crush washer. I do not think I can justify a Battlecomp on grounds of a new washer
    Last edited by Zane1844; 03-20-13 at 11:17.

  10. #20
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    Thanks Zane, I don't think you'll have as much trouble putting them back in as taking them out. I didn't take them out so I'm not sure what position they were in originally. It's secure, I'm wondering if I should have used a sledge now. You can reuse the taper pins.

    Quote Originally Posted by Zane1844 View Post
    Oh no, so I have hell to go through getting them back in?

    If its any help it appears that they are sticking out farther on the right side on mine, though, rest assured, it is not because I moved them

    Also, can I use the same pins to put the FSB back on? I am already in need of a crush washer. I do not think I can justify a Battlecomp on grounds of a new washer

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