Pennsylvania Firearm Owners Association
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  1. #1
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    Default FSB installation help

    Installing an F marked A2-style FSB on new barrel, and committed the cardinal sin - over reamed the forward taper pin hole. Rear hole is perfect. Any hope to salvage somehow?
    “A Republic, if you can keep it.” - Benjamin Franklin

  2. #2
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    Bellwood (Tyrone), Pennsylvania
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    Default Re: FSB installation help

    Is the diameter of your reamed hole tapered? If so do you mean the tapered pin does not get tight and the big end of the pin falls below the outside of the sight? If so, just get the next larger pin. they are sold by numbers from very small diameters to over 1-inch at the small end, each number overlapping the lesser number. Can you measure the small end diameter ? If so let me know and I will check my inventory. The other thing you could do is to tap the sight base, both sides with #6 or 8 and install short set screws.
    Steve Wagner

  3. #3
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    Default Re: FSB installation help

    Quote Originally Posted by SteveWag View Post
    Is the diameter of your reamed hole tapered? If so do you mean the tapered pin does not get tight and the big end of the pin falls below the outside of the sight?
    Steve Wagner
    Yes, that*s exactly what happened. I reamed with a #2/0 reamer and took it too far. Now I can press the taper pin flush with the FSB with my finger. If I tap it tight it is below the surface of the FSB. Unfortunately I*m not sure I have anything accurate enough to try to measure the pin. It*s a Colt taper pin.
    “A Republic, if you can keep it.” - Benjamin Franklin

  4. #4
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    Default Re: FSB installation help

    LocTite.
    Constitutional recognition of gun rights has become Demoncratted

  5. #5
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    Default Re: FSB installation help

    Quote Originally Posted by SteveWag View Post
    If so, just get the next larger pin.
    Steve Wagner
    If I*m understanding the sizing of these pins correctly, it looks like I need a #0 x 1* pin and I*ll need to grind the length down to fit?
    “A Republic, if you can keep it.” - Benjamin Franklin

  6. #6
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    Scenery Hill, Pennsylvania
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    Default Re: FSB installation help

    Order the same taper pin from mcmaster cart, but longer, and cut/grind to fit

  7. #7
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    Default Re: FSB installation help

    So just for future reference, for anyone else who might have made the same mistake I did and stumbled on this thread looking for a fix, initially I just ordered a size #0 pin(the next size larger) that was 1 inch long, but I would’ve also needed to order a size #0 reamer and then ream the hole a lot larger than standard to fit the #0 pin. Instead, I bought a #0 pin that was 2 inches long. On taper pins the large diameter sets the pin size, and the longer they are the smaller the small end gets, so the small diameter end of the 2” taper pin was essentially the same size as a standard #2/0 FSB pin that continued to get larger until it reached the #0 pin size at the big end. That allowed me to cut a slightly oversized standard taper pin out of the 2” #0 pin. I had to grind a little off the small end of the pin to get the proper length, and I had to cut the pin on the big end to the proper length, but I ended up with exactly the custom pin I needed, and didn’t have to touch the hole on the FSB. If you overream your FSB taper pin hole, just buy a #0 sized taper pin that is 2 inches long, and custom fit it to the overreamed hole.
    “A Republic, if you can keep it.” - Benjamin Franklin

  8. #8
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    Default Re: FSB installation help

    YOU DUN GOOD! Thought it through and came to a good easy workable solution. Most people jump the gun and don't stop, sit back, relax and think and then make things worse.
    Ron USAF Ret E-8 FFL01/SOT3 NRA Benefactor Member

  9. #9
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    Default Re: FSB installation help

    Great post!
    Constitutional recognition of gun rights has become Demoncratted

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