AR Striking Primer When Chambering

This is a discussion on AR Striking Primer When Chambering within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; I bought some mags for my Armalite AR chambered in 7.62x39 and I was function checking the new mags by manually cycling some ammo and ...

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Thread: AR Striking Primer When Chambering

  1. #1
    Member Array heavymetalman's Avatar
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    AR Striking Primer When Chambering

    I bought some mags for my Armalite AR chambered in 7.62x39 and I was function checking the new mags by manually cycling some ammo and it smelled like something was burning so I stopped and was looking for the source. I never found out for sure what it was but while I was checking everything out I was looking at the bullets that I had cycled through and I noticed that they had light primer strikes on them, some of them two strikes(cycled through more than once). This is definitely not normal right? Should I be contacting Armalite? I hope the burning smell was not one of the primers partially going off.....that could have been bad.

    Image: (one strike, two strikes, not cycled)

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    Distinguished Member Array C9H13NO3's Avatar
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    Every AR, M4, and M16 I have ever handled does that with the 5.56. I'd assume it's in the design, and would do the same with 7.62.
    -Ryan

    All that is necessary for the triumph of evil is that good men do nothing.

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    VIP Member Array mcp1810's Avatar
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    AR's have a free floating firing pin. When the bolt goes into battery the firing pin is moving with the bolt. When the bolt stops the pin keeps going until something stops it. No big deal.
    Infowars- Proving David Hannum right on a daily basis

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    Member Array heavymetalman's Avatar
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    Oh, ok. The strikes are light enough that I wouldn't think it would set one off, but I just had to make sure. Thanks!

    On another topic the CProducts magazines I got seem to be good, except they forgot to solder one of them

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    Array QKShooter's Avatar
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    I think that burning smell that you smelled was totally unrelated to the task at hand.
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    VIP Member Array Guns and more's Avatar
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    The manual on my new Colt AR said this is normal.

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    Senior Member Array Knuckledrager's Avatar
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    This is normal but it is something to be aware of. Normally, the minimum firing pin indentation needed for ignition is .017" Repeated chambering of the same round can cause damage to the primer. This may change the depth of the indentation needed for ignition and the round may not fire! There have been cases of LEO guns not firing when needed due to this issue. Not re-chambering the same round is a sound practice for a defensive rifle/ammo. Once chambered, put 'em in the range bucket for training use.
    "The liberty of the individual is no gift of civilization. It was greatest before there was any civilization." Sigmund Freud

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    VIP Member Array matiki's Avatar
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    The others posting that this is normal are correct.

    There was an issue with the M-16 when it first went into production - the firing pin was heavier and they were using lighter primers that would cause "slam fires" when you release the bolt on a loaded magazine. Subsequent trial and error resulted in use of heavier primers to reduce the occurence.

    You can also cut down on the potential for this issue by using the forward assist - Holding the charging the handle and closing the bolt with resistance, then confirming that it seats with the forward assist will keep the firing pin from slaming into the primer.

    If you're using military loads you're not likely to run into a problem with soft primers - just be aware that as another response noted, repeatedly slaming the bolt forward onto the same round is just asking for trouble.
    "Wise people learn when they can; fools learn when they must." - The Duke of Wellington

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    VIP Member Array Blackeagle's Avatar
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    Perhaps no one has mentioned this yet because it should be obvious, but make sure you keep the gun pointed in a safe direction when you chamber a round!

  11. #10
    Senior Member Array Knuckledrager's Avatar
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    Quote Originally Posted by matiki View Post
    The others posting that this is normal are correct.

    There was an issue with the M-16 when it first went into production - the firing pin was heavier and they were using lighter primers that would cause "slam fires" when you release the bolt on a loaded magazine. Subsequent trial and error resulted in use of heavier primers to reduce the occurence.

    You can also cut down on the potential for this issue by using the forward assist - Holding the charging the handle and closing the bolt with resistance, then confirming that it seats with the forward assist will keep the firing pin from slaming into the primer.

    If you're using military loads you're not likely to run into a problem with soft primers - just be aware that as another response noted, repeatedly slaming the bolt forward onto the same round is just asking for trouble.
    The forward bolt assist technique may spare the primer a beating but it may cause the extractor to fail to engage the cartridge rim causing a double feed.
    "The liberty of the individual is no gift of civilization. It was greatest before there was any civilization." Sigmund Freud

  12. #11
    VIP Member Array matiki's Avatar
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    Quote Originally Posted by Knuckledrager View Post
    The forward bolt assist technique may spare the primer a beating but it may cause the extractor to fail to engage the cartridge rim causing a double feed.
    That's what the forward assist is for.
    "Wise people learn when they can; fools learn when they must." - The Duke of Wellington

  13. #12
    Distinguished Member Array C9H13NO3's Avatar
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    You should never ride the charging handle home. Always let it go completely when chambering a round. The foward assist is for using if it doesn't go completely into battery. When you shoot, the next round is going to be chambered with the full force of the spring anyway, and it will be dimpled if ejected.
    -Ryan

    All that is necessary for the triumph of evil is that good men do nothing.

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