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Thread: Technical Tip of The Day

  1. #31
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    Not necessarily a technical tip, but a lessons learned from a friend of a friend.

    Long story short. Guy calls me up asking if I have a stock wrench. I do. Says the receiver extension is out of alignment and the buffer detent and spring are not staying in the hole. Figure a loose extension, five minute fix, no problem. However, describing the problem, more to it. Have him bring it over. Missing receiver plate entirely so the extension won't stay put. Buffer detent is bent so far out of shape it's sitting at about a 30 degree angle and is traveling under the BCG when the rifle goes back into battery. Spring is warped to the point of uselessness. And how was the rear takedown detent and spring kept inside you might ask since the receiver plate was missing? Carpenters glue...

    Receiver extension was an aftermarket commercial type that was way out of spec as it was. Stock had to be removed with a screwdriver and wrenched off. Replaced entire receiver extension and stock with a spare (along with a receiver plate), replaced buffer detent and spring, torqued, staked, called that problem fixed. Couldn't do much with the rear takedown detent and spring except maybe drilling it out so left it be since it appeared to work as advertised. Also found his carbine was firing on release as well since the FCG pins were out of spec and not keeping it aligned in the lower (never realized how hard an AR was to get apart when the hammer is forward). Flash hider freely spun and was removed with two fingers. Gas block was not tight and have no idea if the port was aligned correctly. Didn't want to go messing with that too much so I left it be and moved on...

    Very sick carbine. Fixed what I could and told the guy to get it into a competent gunsmith to get the gas system checked over and new FCG pins installed since I only had one set of spares. The guy had it built for him while he was deployed and "it only cost me $650." Claims little to no knowledge on ARs so at least admitting was the first step.

    Moral to the story? If you don't know dick all about ARs and have someone "build" one for you, best to have someone who does know look it over before forking over any money.

  2. #32
    Join Date
    Nov 2012
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    Quote Originally Posted by patrick sweeney View Post
    And if you are working on someone elses rifle, don't let them see you pick up the big screwdriver and start prying.

    I've adjusted gas tubes that way, and some people were not at all happy about it. I guess I should have used the old "Hey look, there's Elvis" routine, and tweaked it while their back was turned.

    Oh well.
    Aint that the truth. People would always wonder why when they would bring their duty rifle in for some repair we would take it into the "back room" to fix and wouldn't let them in. It is because sometimes a little force is necessary and people tend to get tweaky about that sort of thing.

  3. #33
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    There's that.... and the guy who just wants to rush though the work instead of letting you get it done right.
    "You people have too much time on your hands." - scottryan

  4. #34
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    When I was a gunsmith, the phrase I hated the most was;

    "But all you've got to do is....."

  5. #35
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    Quote Originally Posted by patrick sweeney View Post
    When I was a gunsmith, the phrase I hated the most was;

    "But all you've got to do is....."
    when I hear that sentence start I usually do one of two things... cringe, cuz I KNOW what I'll hear next will be bone stupid, or I ask them, usually in an exasperated tone of voice,

    "If you know how to fix it why is it in my shop?"

    Lots of "Umm.. Ahhh..".

    My contribution:

    How to field expedient fix on an out of spec (too large ID) gas block on the fly.

    Long story short, was at a shoot and a guys gb came loose. On examination the gb (no name after market) ID was about .020 too large.

    For various reasons I keep a roll of aluminum muffler tape in my tool box. (It's useful for doing fast road side fixes on leaky mufflers)

    Whipped out my side cutter and nobbled off a strip, slid that between the bottom of the gb and the barrel and retightened the screws. (after adding locktite)

    He shot the rest of the competition with my "frakenfix" in place. He later sent me the upper to do a proper fix.
    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.

  6. #36
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    Customers can make a repair job more difficult to say the least.

    When I worked on other people's rifles I had a sign posted in my garage.

    Labor Rate - $40 per hour
    Customer Watches - $45 per hour
    Customer Helps - $60 per hour
    Train 2 Win

  7. #37
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    I have a few;
    When building your lower cover around the mag catch area and around the bolt stop area with "Blue painter" tape. keeps the reciever from getting scratched.
    When I use my Mig welder to Pin and weld a Comp or when a barrel gets shipped to me and there are some marks on the green parkerize of the barrel. 44/40 cold blue works perfect. Makes small scratches completely disappear.
    Break down and buy yourself a detent install tool. launching the detent pin when you install the front one is a pain in the butt. The tools are cheap and saves you a bunch of time looking around the floor of the detent pin.

  8. #38
    Join Date
    Dec 2009
    Location
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    When installing a muzzle device, make sure you use a thin tappet wrench (left) or you'll get the wrench stuck and leave a scar as I did.


    The wrench flat is thin and a thicker wrench will get caught by the crush washer as it expands. It could prevent proper torque from being reached
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  9. #39
    Join Date
    Jan 2009
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    When using a upper receiver vise make sure it is supported properly and tight inside the bench vise.

    If it's not tight it'll torque in the receiver vise and the edge of the forward assist housing will scrape the side of the bench vise. Done it twice in the last 4-5 years. Both with Vltor MURs. Makes a beautiful little divot at the very tip of the housing.

    Another reason to spend more money with Geissele.

    -Jax
    Last edited by jaxman7; 03-19-13 at 17:31. Reason: incorrect description


    "Despite what your mamma told you, violence does solve problems."
    -Ryan Job



    Quote Originally Posted by Army Chief View Post
    "Elite" designations come from the things that you DO in life, and not from the things that you buy along the way. AC

  10. #40
    Join Date
    Jan 2010
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    Great thread Gunz!

    Instead of busting newbs chops, keep posting good gouge.

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