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Thread: Winchester cases stuck in chamber of M16

  1. #1
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    Winchester cases stuck in chamber of M16

    Ok guys, I can usually find all of my answers with the search button, but this has got me stumped.

    I have had several brass cases fail to extract and end up stuck in the chamber of my rifle during the past couple trips to the range. The rifle is a basic stock Colt M16 Commando. Total round count for the rifle is around 9-10 thousand. Rifle is always fired wet using Slip 2000 ewl. This only happens on full auto firing when the rifle is hot, and only with Winchester 55 grain FMJ 5.56 white box. The stuck cases have to be removed with a cleaning rod or by hitting the stock on the ground while pulling back the charging handle. Once the malfunctions start, I have tried switching ammo (.223 and 5.56 both) and the problem stops. I also tried a different case of Win 5.56 white box and the stuck case problem will come right back.
    I put in new gas rings, ejector spring, heavy duty extractor spring and get the same results.
    I will probably just stay away from the ammo, but I wanted to get some opinions.

    Thanks
    Last edited by Proteinshake; 05-20-13 at 23:06. Reason: forgot to specify brand

  2. #2
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    Have you considered shooting the ammo in another AR that is known to function properly using that ammo? This would allow you to rule it out.



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  3. #3
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    Have you successfully fired the same ammo in the past? Give the chamber a good cleaning and check your extractor, if you havent done so already. Check your buffer spring as well.

  4. #4
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    What does the buffer spring have to do with the extraction issues?

    Quote Originally Posted by Col_Crocs View Post
    Have you successfully fired the same ammo in the past? Give the chamber a good cleaning and check your extractor, if you havent done so already. Check your buffer spring as well.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

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  5. #5
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    I have shot several boxes from the same case of ammo through a 6920 with no problems. If this makes sense, the stuck cases only happen during burst fire and when the rifle is heated up. Semi auto firing is fine. Chamber and extractor are clean.

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    Just looking at it as a moot possibility in that it might be worn/weak and have reduced performance, leading to too fast a cycle, coupled with a possibly worn extractor, thus, Aggravating the problem.

  7. #7
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    Are you 100% sure it's the original barrel? What you are describing sound alot like an out of spec chamber.

    If that ammo is working in another weapon then one would think it's not defective. Has this weapon even been gaged at all?

    Throat erosion, firing pin protrusion, firing pin hole, etc...



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

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  8. #8
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    For sure the original barrel. I was there when it was purchased new. No gauge on it yet.

    I will mention this... About a month ago, I fired approximately 350-400 older Wolf steel cased with no problems. Rifle, especially the chamber has been cleaned a few times since then.

    Does this make sense or is this even possible that the steel cased left something in the chamber that only reacts with Winchester 5.56 cases when heated up from burst fire?

    By the way, the chamber was cleaned using Hoppes solvent, a chamber brush and q-tips after firing the Wolf.

  9. #9
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    Lacquer off the Wolf cases if they were steel. It's now baked on to the chamber walls.

  10. #10
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    Quote Originally Posted by sinister View Post
    Lacquer off the Wolf cases if they were steel. It's now baked on to the chamber walls.
    I thought this had been proven to be an urban legend?
    https://www.m4carbine.net/showthread.php?t=73358
    Last edited by CrazyFingers; 05-21-13 at 10:40.

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