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Thread: Trick to removing FSB?

  1. #11
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    Oh yeah... BCM's taper pins... There's a thread on that around here somewhere. They recommend the above listed stuff and either a good, solid workbench or setting it on a concrete floor so as not to get any surface flex and impact absorption.
    ETA: Found it!
    https://www.m4carbine.net/showthread.php?t=41732
    Last edited by Col_Crocs; 01-30-12 at 23:44.

  2. #12
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    I'll second the recommendation of the sturdy work surface and a solid steel punch, preferably about 1/4" in diameter, but in several hundred removals the only time I've had to use anything more than an 8 oz ball peen is when the pins weren't hardened.

    It's helps to secure the FSB in such a manner that it cannot rock with the impact. I use a scrap piece of HDPE with a shallow groove in it. I don't get a lot of use out of the sling swivel rivet stake part that I milled in anymore though.



    You cannot tap them out though, you must drive them out. Make the first hit count. The bigger and flatter the punch the easier it is to do this. You don't want to use some 1/8" punch and risk it slipping off the pin.

  3. #13
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    Use a hardened nail set punch

    I use a torch and heat the pins, then hit them with Kroil, then heat a little bit more, then SMACK the dog shit out of them with a hardened nail set with the sight base on a 2X4 on cement floor, then tap them the rest of the way out with the proper sized punch. Done several and this way works the best for me without buggering up the tapper pins. I then reuse the pins (Horror of Horrors)

    Until that day,
    Darkop
    Right or wrong, black or white. Cross that line, your gonna pay, but in the dawn before the light, we live or die by shades of gray.

  4. #14
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    I've been liquid wrenching my BCM's FSB taper pins and just obliterating them with my punches and 12oz. hammer, and my rubber mallet, for 2+ days. Those suckers have yet to budge. Flash hider came off easy as pie, as did the gas tube roll pin...but those two taper pins aren't budging.

  5. #15
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    Quote Originally Posted by aaron_c View Post
    rubber mallet


    Are the pins deforming?

  6. #16
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    For taper pins I use the pictures brass hammer and the two punches pictured. It's more technique instead of brute force.

    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  7. #17
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    Hammer is on the red tool box, the heavy duty pin pin is just below the action block to the left of the 1/2-28 die.



    That's usually the problem with insanely tight pins.

  8. #18
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    Bravo 14.5 LW middy

  9. #19
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    Quote Originally Posted by Tweak View Post


    Are the pins deforming?
    Didn't appear to be, but I ended up getting the handguard cap off yesterday (which was the goal behind removing the FSB) with some pliers and tin snips. It wasn't that difficult at all, really. Took about 15 minutes.

  10. #20
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    Wouldn't happen to be near Western WA would you?

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