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AR not accurate at all

Discussion in 'Rifle Discussion' started by cash$$cow, Jan 10, 2012.

  1. cash$$cow

    cash$$cow Eastern Wa Member

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    Built a Spikes lower a while back and did some trading for a complete upper. Took it out and it's all over the map. No two shots seem the same. Can't keep it on paper. We put a bowling pin at 25 yards. It would hit then be left, right, high, low then who knows


    Where do I start with this. I will try and get some info off the barrel when I get a chance


    I have tried PMC and Remington ammo.
     
  2. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    Ouch. Sounds like your barrel is loose. I would get that looked at chop chop.
     
  3. coop44

    coop44 Tacoma ,WA Well-Known Member

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    stick with one kind of ammo, for consistancy, for now I would use the remington. Make sure the barrel is properly tightened onto the upper reciever. Make sure you have proper headspace. make sure the muzzle crown is even and concentric. Shoot from a bench carefully and slowly. if you have a freefloat tube, great. it could be one of these or a combination, or something entirely different.

    all I could think of for now.
     
  4. doubletap007

    doubletap007 Beaverton Active Member

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    what aiming device?scope?flip up sites?red dot?all of the above?
    loose barrel and head space sound like a good bet too as the other 2 said but my first thought was a knock off red dot that wont hold accurate.
    also barrel rifleing 1:9?1:7? and what grain ammo with that?if your running a 40gr bullet with a 1:7 bbl that would explain it but sounds like your probably well seasoned with ar's building your own and all so im sure you have ammo vs.rifleing figured out.
     
  5. Burt Gummer

    Burt Gummer Portland Completely Out of Ammo

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    Optic lose on mount was my issue once.
     
  6. Old Hick

    Old Hick Oregon Active Member

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    Are you using a rest or no rest?

    Cheap red dot or optic not holding true?

    Front sight not pined and loose?

    is it a 5.56 or 223 barrel? How about ammo? 5.56 or 223?

    twist as others have stated?

    Lot's need to be answered yet.


    Stay Safe.
     
  7. cash$$cow

    cash$$cow Eastern Wa Member

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    @ double tap

    Both open sight and a handy 4x 32 to see if the flip up was floating shooting 55 and 63 grain and pretty sure it's a 1-9. Loose barrel not sure. I am lost on the Head space and muzzle crown comments
     
  8. Old Hick

    Old Hick Oregon Active Member

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    barrel should be stamped stating what twist and caliber.
     
  9. cash$$cow

    cash$$cow Eastern Wa Member

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    Bench rest, 556, front sight pinned and tight
     
  10. doubletap007

    doubletap007 Beaverton Active Member

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    can someone chime in and explain the need for proper head spacing,and the process?what does that mean?
     
  11. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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  12. doubletap007

    doubletap007 Beaverton Active Member

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    i just learned the barrel nut must be torqued to 50ftlbs.and the barrel and bolt coming from different companies may require you to check head spacing to make sure they match up ok.

    also buffer tube....are you sure your buffer tube is right for your gun and stock?if not your issue could be from lack of bolt action or too much spring?
     
  13. A.I.P.

    A.I.P. UpperUS Active Member

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    Loose barrel or bad scope, probably scope
     
  14. cash$$cow

    cash$$cow Eastern Wa Member

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    Thanks to all. Let me check the things mentioned and see what I come up with.
     
  15. Nwcid

    Nwcid Yakima and N of Spokane Well-Known Member

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    Where at in "Eastern WA"? Someone local might be able to help too........
     
  16. cash$$cow

    cash$$cow Eastern Wa Member

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    @ Nwcid

    Sunnyside area.
     
  17. iamme

    iamme Lane County Well-Known Member

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    Hmmm no one mentioned yet but sometimes the quality of parts can do this. WHO is the upper made by? Scope could be issue as well. What BUIS are you using??
     
  18. madcratebuilder

    madcratebuilder Ardenwald, OR Well-Known Member

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    On the AR15 with a new barrel and a new bolt you have a 99.9999999% chance of correct head space. Checking head space on modern made rifles is way over blown on the net.
     
  19. bulzeye

    bulzeye scappoose Member

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    have you let someone else try shooting it to see if it has the same issue?
     
  20. ZigZagZeke

    ZigZagZeke Eugene Silver Supporter Silver Supporter 2015 Volunteer

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    See my thread in the "Gunsmithing and Repairs" section titled "Bushmaster Accuracy Issues". I went through everything before deciding I needed a new barrel.