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Thread: Dented case on ejection

  1. #21
    samalama76
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    OK. Maybe I missed it, but what is causing the dented case mouth? I have this on almost all my spent casing and it is not a huge problem, but it is very irritating. Please advise or call me an idiot and refer me to the post that explains it. Thanks in advance.

  2. #22
    Moderator bwaites's Avatar
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    No idiocy! Two things cause it:

    1) Most commonly it is striking the deflector behind the ejection port. That's why the deflector is there. If you don't like the dented case mouths, put a piece of the loop (soft) side of velcro there and it will disappear.

    2) Cases striking the concrete. Obvious fix, don't shoot on hard surfaces.....LOL.

    There is a permanent fix, and that requires shortening the ejector spring very slightly, and there is a link to directions on how to do that on the board.
    ”You seek escape from pain. We seek the achievement of happiness. You exist for the sake of avoiding punishment. We exist for the sake of earning rewards. Threats will not make us function; fear is not our incentive. It is not death that we wish to avoid, but life that we wish to live.” - John Galt

  3. #23
    elkbow
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    you may have trimmed the spring too short, but you may be fine with a gas adjustment. many things can affect ejection/extraction, I usually go very little on the ejector spring to check the reaction, usually do it at the range, since you also have an adjustable gas block, put some more gas through it

    on your last shot did the bolt lock open? try shooting one shot at a time from the mag and see if your bolt locks open and if the rounds eject, increase gas slowly to see what happens and if you can get the rounds to eject and what the angle is, then load up a magazine with 5 rounds and try again

  4. #24
    Chieftain BjornF16's Avatar
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    ejector springs.jpg


    This is the pic of the ejector springs: Top is the original size; bottom was my first attempt at reducing size (which resulted in no ejections); middle is my second attempt at reducing size.

    I plan on going to the range today and will report back findings.

  5. #25
    Chieftain sneaky one's Avatar
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    Did you change the extractor spring? At least bring a new one and the tools to swap it out at the range. Most people are very helpful at the range-if you need the extra 3 hands., they will step up. Good luck, we all hate an unreliable rifle.

  6. #26
    Chieftain BjornF16's Avatar
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    Range report: New spring (trimmed by 1.5 coils) = proper ejection.

    The first case ejected had the body dent...reduced the gas and the cases did not have the dent (nor collapsed neck). The cases are still ejected further than I'd like but there is no damage to the spent cases (which is the main goal).

    Have not messed with extractor spring and have no intentions.

  7. #27
    Deezil
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    Good to know. Will have to tinker with mine. Thanks!

  8. #28
    Chieftain sneaky one's Avatar
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    Good job Bjorn, the ejector spring needs to stay close to stock length=1.5--2.0 coils cut- is all that's needed... I'll have to install the adj. gas block soon. I guess you got lucky on extractor spring issues, for now....

  9. #29
    Chieftain BjornF16's Avatar
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    Quote Originally Posted by sneaky one View Post
    I guess you got lucky on extractor spring issues, for now....
    My "other" Grendel is an AA Entry...no extraction issues whatsoever. I'll probably trim its ejector spring 1.5 coils since it also has a propensity to deform spent case necks. I wish I had an adjustable block for it...

  10. #30
    lizard6.5
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    Hey i am new to site but i have had trouble with dented brass went through alot trying to figure out why it was shaving brass and denting the brass i changed the buffer spring to try and slow cycle changed stock buff and spring agian did not change sent it to jt said it was fine and sent me adjustable gas block wrong size so gave up at that point me and a buddy was reloading some brass and tried a littel hotter load and guess what the brass came out with no dents my load was 123 amax hodgdon blc2 powder 31.8 grains cci primer it tighted up my group to 100 yards 3 shots dime size

  11. #31
    Gswamp
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    I might give this a go on my Grendel. I installed an adjustable gas block that has softened the blow some. This might just be the cure for my dented cases

  12. #32
    JohnOD
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    Quote Originally Posted by BjornF16 View Post
    Range report: New spring (trimmed by 1.5 coils) = proper ejection.

    The first case ejected had the body dent...reduced the gas and the cases did not have the dent (nor collapsed neck). The cases are still ejected further than I'd like but there is no damage to the spent cases (which is the main goal).

    Have not messed with extractor spring and have no intentions.
    It doesn't take much. Always a good idea to have an extra couple of springs on hand before starting any "dremel gun smithing"

  13. #33
    Schwag173
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    Quote Originally Posted by bwaites View Post
    No idiocy! Two things cause it:

    1) Most commonly it is striking the deflector behind the ejection port. That's why the deflector is there. If you don't like the dented case mouths, put a piece of the loop (soft) side of velcro there and it will disappear.

    2) Cases striking the concrete. Obvious fix, don't shoot on hard surfaces.....LOL.

    There is a permanent fix, and that requires shortening the ejector spring very slightly, and there is a link to directions on how to do that on the board.

    Might the problem also be fixed if a guy were to swap out for the next-heavier weight of buffer? (I already have an M-16 bolt carrier.)

  14. #34
    Warrior
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    A heavier buffer will slow down the carrier but a strong ejector will still kick the case out with the same velocity.

  15. #35
    Chieftain sneaky one's Avatar
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    Take a 1-1.5 coil -off, Then try different buffer wts., say h1-h2. rasp knows his velocities. We both have an awesome ejector setup. Always have an extra eject spring , or 3-- if in tweak mode. Cheap to buy.

  16. #36
    Whelenon
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    I'm seeing small dents on the body of my brass. Looks like my solution is here so I'm just marking this thread for future reference.

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