Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 34

Thread: Getting FSB pins in

  1. #21
    Join Date
    Feb 2008
    Posts
    728
    Feedback Score
    3 (100%)
    Quote Originally Posted by comp1911 View Post
    IIRC DD taper pins are 3/4" long, 1/8" shorter then the standard AR taper pin.
    By my measurements, it looks like they are intended for a close to exact fit.
    'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley

  2. #22
    Join Date
    Dec 2011
    Posts
    25
    Feedback Score
    0
    Quote Originally Posted by Amicus View Post
    Undocumented: Your comments on taper pins and their function are well-taken and I will file that away. After reading that, I am almost glad they didn't fit. Almost.

    wrench: Reamers? I suspect that I have reached my level of incompetence and this is not the upper I want to learn on. I will PM you later on a few things. I hope you don't mind.

    p.: Thanks for the additional comments on the reaming process. That too I will file away. Under the circumstances, DD may be the way to go, but I have to get this done quickly (for the reason stated previously).
    It sounds intimidating, but it's actually very easy. If you use some oil, and go slow, clearing chips, and checking fit, it's easy to do. Feel free to PM me.

  3. #23
    Join Date
    Jul 2008
    Posts
    561
    Feedback Score
    1 (100%)
    This is the third or fourth thread I've seen mentioning short taper pins on DD uppers (even after fully seating since they come loose from factory).

    My DD upper is the same way, even after pounding them in they are not flush on the smaller side. That being said, I can't see them going anywhere anytime soon and I've decided to leave well enough alone.

    I'm installing a rail later this month and at that point, since it will be apart anyway, I may go ahead and put new pins in during reassembly.

  4. #24
    Join Date
    Feb 2008
    Posts
    728
    Feedback Score
    3 (100%)
    Right now my plan is to shoot it this weekend with my son, see what happens. It should function fine. I am also mildly curious to see if it has any "special" qualities.

    (Don't get me wrong. I come from a science and law background, and they are pretty logical and unforgiving disciplines. But, every so often, you run into situations where you are in the presence of something unexplainable and mysterious. I've seen this with weapons, autos, musical instruments, occasionally with old watches -- things that can create a fairly intense meaning to the user. I have hopes for this rifle, but I won't bet the farm on it.)
    'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley

  5. #25
    Join Date
    Dec 2011
    Posts
    25
    Feedback Score
    0
    You mean "Special qualities" like turning lead into diamonds?

    I'd like a gun with qualities like that. I'd just shoot it into a barrel of water all day long...


    In all seriousness, if the pins are indeed inserted correctly (which I believe they are), your rifle should be fine, aside from a slight cosmetic issue that will only be apparent upon close inspection, and should have no effect on the function of the weapon itself.
    I manufacture barrels, guy.

    Nothing in the rules when I signed up said that I would have to volunteer my name to be dragged through the mud by a bunch of blowhards who are so incredibly self-absorbed that they quote THEMSELVES in their own signature lines; just because I shared an opinion that differed with their world view.

  6. #26
    Join Date
    Feb 2008
    Posts
    728
    Feedback Score
    3 (100%)
    Just a quick update. The upper has been in DD's hands for about two weeks, and I expect that they will take care of any "issues." I am glad they were so friendly about it, but I never expected anything else.

    Part of the reason I sent it back to DD was that I thought they might benefit from taking a look at the barrel. The pins were not the only aspect of the barrel that I did not like (but, I won't go into that).

    I felt that I had reached the limit of my competence, and I should learn to take stock of the situation before attempting my own work. I will get a reamer (or two) before I try this again, and now I know another thing to look out for. Since this was my seventh build, I thought I knew what I was doing. Ha!

    Wrench: I haven't forgotten that I was going to PM you. I do have a few questions, but I haven't quite figured out what they are.
    'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley

  7. #27
    Join Date
    Oct 2007
    Posts
    313
    Feedback Score
    0
    Seems like this post is timely for several here...me included. I'm putting my FSB back on tomorrow after shaving it down today. Fun project to do actually. I was considering replacing the pins as it seems like those are a one-time-use-only type of thing. Is this something that would benefit from a bit of loc-tite prior to driving the pins in or does it really not matter? While I've never seen on pop out during use mind you, I just have a habit of adding it to items like that.

  8. #28
    Join Date
    Jul 2009
    Location
    SE Tennessee
    Posts
    1,153
    Feedback Score
    22 (100%)

    Taper pins are cheap enough that it's a good idea to replace. With the beating that they take going in and out, they're bound to suffer some deformation. The result may be that they wont fully seat because the trailing end has flared out, or they may cause the gas block to have a slight wobble. The wobble was a result of the pin on the right in the picture. The old pin was a DD taper pin, and didn't hold up to repeat installation. I get hardened steel taper pins from a local source for about .60ea and trim them after installation, leaving about 1/8" exposed. A little chemical blackening and we're good to go.
    "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -Benjamin Franklin

  9. #29
    Join Date
    Feb 2008
    Posts
    728
    Feedback Score
    3 (100%)
    Quote Originally Posted by Quiet-Matt View Post

    I get hardened steel taper pins from a local source for about .60ea and trim them after installation, leaving about 1/8" exposed. A little chemical blackening and we're good to go.
    What kind of source for hardened taper pins? Are they made specifically for ARs, or have you repurposed?
    'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley

  10. #30
    Join Date
    Mar 2009
    Location
    Alabama
    Posts
    2,770
    Feedback Score
    0
    I will just throw this out here after replacing to many damn press fit bearing that I cant count any more.
    Put the Damn pins in the freezer for a couple of hrs or better yet over nite before you try to drive them in.

Page 3 of 4 FirstFirst 1234 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •