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Thread: Technical Tip of The Day

  1. #21
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    Quote Originally Posted by patrick sweeney View Post
    That hasn't been my experience. Consider how many variables determine the location in space of the open end of the gas tube;

    Axial alignment of front sight rings to front sight gas tube tunnel.
    Perpendicularity of the gas tube pin hole, and the gas tube locaiton hole for that pin
    Bends made in the gas tube by the manufacturer to meet specs
    Bends inadvertently added by warehouse, packer, other gear in shipment, storage on shelf and schlepping to your AO.
    Inadvertent bending induced by assembly, as you wrestle it into place.
    Alignment of barrel nut clearance cut.
    Location of clearance hole drilled in upper receiver

    Maybe I've worked on too many frankenguns, but I go into it assuming Ill have to at the very least check alignment, and probably adjust it to make it a perfect fit.

    But a good tip, and one worth having in your bag of tricks.
    Sounds more like you've had to work with a bunch of shoddy out-of-spec parts.
    Semper Paratus Certified AR15 Armorer

  2. #22
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    A lot of my learning curve was done in the 1980s, when there was Colt and everything else. It made me, and keeps me, suspicious of everything out there, Colt included.

    With dozens making the main components, and hundreds making the smaller ones, the permutations run in the thousands.

    I assume everyone is doing their best, but I still check every detail.

  3. #23
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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.
    My grandfather adjusted my first car's door with a 2x4 by slamming the door on it with it in the hinge area. I was unfortunate enough to have seen it. It hurt my tender 17 year-old brain.

    Fast-forward to age 25, and although my grandpa did not like GM, I wish like anything that he had still been alive so that I could call him and tell him that I watched the folks up at Bowling Green, KY adjust the panels on my Z06 on the assembly line...with wooden wedges and regular hammers. It would have made his day!

    Even in the world of CAD and CNC and laser cutting/etching...sometimes a hammer and/or a wedge really are what is called for.
    Last edited by WS6; 03-08-13 at 18:53.

  4. #24
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    Technical Tip of The Day- New

    One of the guys in a recent class had purchased some type of gun show POS pistol grip. Not only was it a POS, but the grip screw was wrong. It was about 1/2 inch longer than the standard one and had the incorrect threads.

    Problem- Stripped out grip screw hole and damaged threads. Additionally the selector lever detent spring was damaged in the process.

    Solution- I had him purchase a Magpul MOE grip with the correct screw and we were able to thread it in the hole without issues. Replaced selector lever detent spring.

    If you are swapping grips or (doing any task you aren't familiar with) ensure you understand what tools are needed and know what you are doing. Do not use any questionable parts. Try and check things like parts in advance before you start the task.



    Owner/Instructor at Semper Paratus Arms

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    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  5. #25
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    Quote Originally Posted by Iraqgunz View Post
    I thought it would be interesting to post some observations from things I have seen over the years, and specifically in regards to things I have seen over the last few months teaching my AR15 Armorer Course.
    This is an excellent idea Iraqgunz. Thank you for taking the time to do this.

    Joe Mamma
    "Reliability above all else"
    NRA Certified Pistol and Rifle Instructor, Life Member
    Glock Certified Armorer
    Beretta & Sig Sauer Certified Pistol Armorer
    Colt Certified 1911 & AR-15/M16/M4 Law Enforcement Armorer

  6. #26
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    Congratultions on a great idea

    Problem: safety selector very stiff, but not when grip is off.

    Solution A: extend the hole in the grip with a small drill to allow the normal spring compression thus lessening the tension on the pointed detent.

    Solution B: clip a few coils from the spring and try to find a comfortable tension.

    problem 2: If the opposite is true, try placing a small filler into the grip hole to increase tension to the suitable amount.
    Last edited by 308sako; 03-09-13 at 19:58. Reason: The deep hole addition!

  7. #27
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    Quote Originally Posted by 308sako View Post
    Problem: safety selector very stiff, but not when grip is off.

    Solution A: extend the hole in the grip with a small drill to allow the normal spring compression thus lessening the tension on the pointed detent.

    Solution B: clip a few coils from the spring and try to find a comfortable tension.

    problem 2: If the opposite is true, try placing a small filler into the grip hole to increase tension to the suitable amount.
    I've put several carbines together with PSA LPKs. I always have to clip 3 coils off of their safety detent spring, I don't know why they use longer springs.

  8. #28
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    Quote Originally Posted by Iraqgunz View Post
    Using a flat tip screwdriver we placed it into the upper between the receiver wall and the tube and then did a slight tweaking. The tube straightened and the carrier moved freely afterwards.
    When you do this, are you turning the screwdriver blade to cock the tube away from where it's contacting? Or are you pressing the flat of the screwdriver against the tube away from where it's contacting?

    I don't know if this tip will help with an AR15, but a car detailer showed me a trick to make your own lock washers to retain screws that come loose too easily. Cut a small strip from a plastic sandwich bag. Bend it into a U across the threaded end of the screw, and screw it in. The plastic gets into the threads and acts like a nylon lock washer.

    I've used this trick successfully with my car, door handles, and my 1911 grip screws. I suppose you could use it on an AR hand grip or some sight systems. However, I wouldn't use it anywhere where heat might melt the plastic.
    Last edited by Whytep38; 03-10-13 at 10:09.

  9. #29
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    Quote Originally Posted by Whytep38 View Post
    I don't know if this tip will help with an AR15, but a car detailer showed me a trick to make your own lock washers to retain screws that come loose too easily. Cut a small strip from a plastic sandwich bag. Bend it into a U across the threaded end of the screw, and screw it in. The plastic gets into the threads and acts like a nylon lock washer.

    I've used this trick successfully with my car, door handles, and my 1911 grip screws. I suppose you could use it on an AR hand grip or some sight systems. However, I wouldn't use it anywhere where heat might melt the plastic.
    This could be a useful tip for a lot of things when there is not a proper fix.

  10. #30
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    Quote Originally Posted by Henchman View Post
    This could be a useful tip for a lot of things when there is not a proper fix.
    I have used rubber O rings for this purpose a couple times but not good when heat is involved.

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