Quantcast
  1. Sign up now and join over 35,000 northwest gun owners. It's quick, easy, and 100% free!

Gunsmith test time

Discussion in 'Maintenance & Gunsmithing' started by wichaka, Oct 15, 2008.

  1. wichaka

    wichaka Wa State Well-Known Member

    Messages:
    2,374
    Likes Received:
    793
    Had a neighboring LE agency bring an AR to me, saying it won't cycle. It acts like a single shot rifle.

    What's wrong?
     
  2. sweetbeard

    sweetbeard Beavertown OreGUN! New Member

    Messages:
    2,199
    Likes Received:
    22
    It is not an AK..



    BooyA.. That just happened!
     
  3. frizzz

    frizzz Clackamas Member

    Messages:
    132
    Likes Received:
    9
    Check gas tube, give it a good cleaning and lube.
     
  4. Doubletap

    Doubletap Newberg Well-Known Member

    Messages:
    1,274
    Likes Received:
    147
    Cops got their hands on it...:laugh:
     
  5. emanon

    emanon SE Portland, Oregon Member

    Messages:
    416
    Likes Received:
    3
    Gas tube blockage or weak magazine spring?
     
  6. borrowedsig

    borrowedsig Lincoln, Nebraska Active Member

    Messages:
    319
    Likes Received:
    35
    Gas chamber i think as well. Does it actually cycle and eject the shell or does it just fire and not cycle?

    Matt
     
  7. wichaka

    wichaka Wa State Well-Known Member

    Messages:
    2,374
    Likes Received:
    793
    Fires, but does not eject.

    I will let this run until later tonight.......and I'll give the answer and post some pics.
     
  8. friskydingo

    friskydingo Oregon, NorCal, and Panama. Yes. All three New Member

    Messages:
    807
    Likes Received:
    5
    gotta be the gas...... have they tried different kinds o' ammo?
     
  9. sweetbeard

    sweetbeard Beavertown OreGUN! New Member

    Messages:
    2,199
    Likes Received:
    22
    Gas block missing.. they did some ninja S on it!
     
  10. SteveZ

    SteveZ Lake Stevens, WA Member

    Messages:
    73
    Likes Received:
    0
    Those three little gas washers that are on the bolt.....make sure the notches on all three aren't perfectly lined up.
     
  11. wichaka

    wichaka Wa State Well-Known Member

    Messages:
    2,374
    Likes Received:
    793
    Nice try with all........and contrary to popular belief, you don't need to mix up the slots in the gas rings. Every time the bolt cycles, the gas rings move around.

    Here's a hint;

    bcg1.jpg
     
    Last edited: Oct 16, 2008
  12. Joe Link

    Joe Link Portland, OR Well-Known Member Staff Member Lifetime Supporter 2015 Volunteer 2016 Volunteer

    Messages:
    5,986
    Likes Received:
    3,975
    I saw what you did there :D
     
  13. sweetbeard

    sweetbeard Beavertown OreGUN! New Member

    Messages:
    2,199
    Likes Received:
    22
    I was always told to stagger those :confused:
     
  14. wichaka

    wichaka Wa State Well-Known Member

    Messages:
    2,374
    Likes Received:
    793
    ....and we were told Anna Nichole Smith married for love.

    Next time we get together, I pull out a bolt, align the ring gaps, put it back together, and it'll fire/cycle just fine.

    If you don't think those rings spin around.........align the rings, then cycle the bolt 10-20 times, just like firing off a magazine. Take out the bolt and see what position the rings are in.


    Rumor #1 about the AR, always make sure the gaps of the gas rings are not aligned............UGH!
     
    Last edited: Oct 16, 2008
  15. sweetbeard

    sweetbeard Beavertown OreGUN! New Member

    Messages:
    2,199
    Likes Received:
    22
    Well I am going to send a letter to MCRD Sandiego and tell they about it! No wonder Blacky always jammed...
     
  16. SgtKashim

    SgtKashim Wilsonville, Oregon Member

    Messages:
    209
    Likes Received:
    12
    Hm. Does smell like a gas system problem. For whatever reason the pressure difference between the gas system and the buffer spring is too low. I guess the problem could be on either end - the gas system is clogged, the FSB/gas block is off the slot, or the buffer spring is too strong (might be using one designed for hotter military ammo in a rifle loaded with very weak commercial loads...).
    Gas key might be loose, or, going back to the rings, one of the gas rings may be compressed or damaged. My money is on the gas key, though. Theres a lot of force being exerted at a funny angle on that part.
     
  17. wichaka

    wichaka Wa State Well-Known Member

    Messages:
    2,374
    Likes Received:
    793
    We have a winner!

    The pic above should have given it away. Look at the lack of staking of the gas key screws, a spider monkey with a marshmallow hammer could have done better!
    The gas key came loose, exhausting the gases out around the key, not allowing a build up of enough pressure to cycle the bolt carrier.

    We won't go into what make this was........unless you really wanna know.

    Pic 2;

    bcg2.jpg
     
  18. Joe Link

    Joe Link Portland, OR Well-Known Member Staff Member Lifetime Supporter 2015 Volunteer 2016 Volunteer

    Messages:
    5,986
    Likes Received:
    3,975
    I want to know the make! :)
     
  19. friskydingo

    friskydingo Oregon, NorCal, and Panama. Yes. All three New Member

    Messages:
    807
    Likes Received:
    5
    hhhhrrrrmmmmm DPMS? you picture doesn't show up for me??? weird. i have seen some bad staking before. some times it doesn't even touch the screws.
     
  20. coctailer

    coctailer Portland, OR/Hastings, MI/Vancouver,WA I run with scissors.

    Messages:
    5,074
    Likes Received:
    584
    It's Olympic or RRA.
     
Thread Status:
Not open for further replies.