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gas escaping from block

Discussion in 'General Firearm Discussion' started by BDA.45, Feb 18, 2016.

  1. BDA.45

    BDA.45 oregon Well-Known Member 2016 Volunteer

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    So I just tore my ar down for a cleaning. I usually don't remove the quad rail cause it extends past the gas block and has the front sight mounted. Well I did and found that gas has been coming out the bottom of the tube/block. I should clarify, coming out where the tube goes into the block. Rifles got about 20-30000 rounds through it. Most of those have been shot with a can on. Do I need a new block? Tube? What's goin on, is the can causing too much pressure or something? Heat?
     
  2. MountainBear

    MountainBear Sweet Home, OR Well-Known Member

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    Is the rifle malfunctioning? If it is, then start by changing the cheap parts first (gas tube likely) and then the block to see if it fixes the issue. If it isn't malfunctioning or damaging parts, then I wouldn't worry.
     
    Dyjital likes this.
  3. oli700

    oli700 Rogue Valley Well-Known Member

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    perfectly normal
     
  4. BDA.45

    BDA.45 oregon Well-Known Member 2016 Volunteer

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    It just started to malf. Failure to eject. I chalked it up to being dirty. Got a lot of rounds this time before cleaning.
     
  5. oli700

    oli700 Rogue Valley Well-Known Member

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    you didn't mention malfunctions .....not normal lol

    most AR's leak at the tube/block junction, not enough to matter but enough to build up some serious carbon.....in fact I have never seen a clean one
     
  6. Pistolcraft

    Pistolcraft Oregon New Member

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    Make sure the set screws that hold the block in place are tight. Also, if it's having an ejection problem with that many rounds, could be gas rings. Quick check for that, remove bolt carrier assembly, extend bolt out, and set on a hard surface on bolt face. If the weight of the assembly causes the carrier to drop, you may need new gas rings. Check extractor for tension and damage, and gas tube for clearance. Factory ammo or reloads? Jacketed or lead bullets?
     
  7. BDA.45

    BDA.45 oregon Well-Known Member 2016 Volunteer

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    Well rings and extractor seem to be perfectly normal. I'm leaving the malfs to cleanliness. Block is pinned in place and has never been removed.
     
  8. MountainBear

    MountainBear Sweet Home, OR Well-Known Member

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    In my experience as a gunsmith, about 90% of malfunctions that walk into my shop can be solved by a proper cleaning. Good place for you to start, and from the sounds of it, that is your likely culprit. Good luck!
     
  9. oli700

    oli700 Rogue Valley Well-Known Member

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    that floors me man :eek:
     
  10. BDA.45

    BDA.45 oregon Well-Known Member 2016 Volunteer

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    10-4, I'll keep shooting it and keep an eye out on the carbon buildup. If it gets significant quickly I'll start with the tube
     
    oli700 likes this.
  11. BDA.45

    BDA.45 oregon Well-Known Member 2016 Volunteer

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    Well he IS right.........
     
  12. MountainBear

    MountainBear Sweet Home, OR Well-Known Member

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    Often, it isn't the owners fault. Sometimes, the gun just needs to be taken down further than field stripping. A lot of old .22's need to be stripped to pins and springs to clean out that 50 years of gunk, oil, and unburned powder...

    Most gun owners aren't equipped to strip guns completely apart... And get them back together. Before my gunsmithing days, I was guilty of taking my smith a baggie o' gun...