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First AR15 build issues

Discussion in 'Rifle Discussion' started by Tankistheman, Jul 18, 2016.

  1. Tankistheman

    Tankistheman Klamath County Member

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    image.jpeg Completed my first build and everything went smoothly, or so I thought. Racked a couple of rounds as a small test. Examined the rounds and noticed that the primers had been hit. Obviously not enough to fire the rounds bug still scary. Any thoughts would be a huge help. Thanks.
     
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  2. No_Regerts

    No_Regerts United States Well-Known Member

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    Did you put the firing pin retaining pin in the bolt carrier?
     
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  3. Tankistheman

    Tankistheman Klamath County Member

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    Yeah and disassembled and reassembled. Still did it then my buddy, an army veteran, did the same and he said the bolt looked good and he had no idea.
     
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  4. clearconscience

    clearconscience Vancouver, WA Well-Known Member

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    Yeah something is wrong with your bcg or bolt at least would be my guess.
    Is your retention pin in?

    Let us know what you find
     
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  5. Tankistheman

    Tankistheman Klamath County Member

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    Yeah it's in. Everything image.jpeg is up to snuff as far as I know. I'm really scratching my head. image.jpeg
     
  6. Vorpalis

    Vorpalis Portland, OR Active Member 2016 Volunteer

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    In an AR a dented primer is normal when you chamber a round, because the firing pin free-floats inside the carrier. Most other rifles have a spring that holds the firing pin back to keep that from happening. It's worrisome if you don't know, but it's not enough to set off the round.
     
  7. Tankistheman

    Tankistheman Klamath County Member

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    So it's normal? Awesome cause it's kind of a scary sight. Yeah obviously I had no idea that was normal. Had never seen that with any of my other guns, but this is also my first AR. Makes sense now! Thanks for putting me at ease Vorpalis.
     
  8. No_Regerts

    No_Regerts United States Well-Known Member

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    Your buddy got an AR? Switch BCGs and see if you get a similar result.
     
    Last edited: Jul 18, 2016
  9. Vorpalis

    Vorpalis Portland, OR Active Member 2016 Volunteer

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    If you take the bolt carrier group, push the bolt back into the carrier, like it would be when in-battery, then tip the bold end downward and you'll see the firing pin protrude. That's what's happening when you chamber a round, only with *slightly* more force.

    One thing to note is that, in rare cases, a round that's been chambered before and has that slight dent, might not fire reliably. This is fine with practice ammo, but if you keep your AR loaded for defensive use or duty, once a round has been chambered and extracted without firing, relegate it to practice.

    Here's a Tavor firing pin with its retaining spring:
    products_FiringPinWithSpring.png
     
  10. clearconscience

    clearconscience Vancouver, WA Well-Known Member

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    I've built a few but I guess I've never chambered a round that didn't get fired.

    Good to know
     
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  11. Tankistheman

    Tankistheman Klamath County Member

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    No actually he doesn't. He's now a broke bubblegum teacher lol I'm trying to talk him into building one.
     
  12. Tankistheman

    Tankistheman Klamath County Member

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    Great to know I will check this out when I get a chance. Thanks for the information. If you've never seen or experienced this, it was a little unnerving at first. Now that you've explained it though it makes total sense. I'll probably look into that firing pin.
     
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  13. Medic!

    Medic! What just happened? Has eagle eyes. But cant remember what he saw. Bronze Supporter

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    The AR-15/M-16 works well as designed.

    Don't fix it till it's broken. ;)
     
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  14. Medic!

    Medic! What just happened? Has eagle eyes. But cant remember what he saw. Bronze Supporter

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    You don't know what you don't know.
    And judging from the fact you don't know this light primer strike is normal. You should realize there is a lot to learn. And maybe you should not go redesigning the rifle just yet. :D

    As an example.
    Lighter hammer springs give a nicer trigger. But may fail to ignite some ammo.

    And any company selling a part like an aftermarket firing pin. Or spring kits. Or fancy guide rods. has only to sell parts. And make money.
    A company selling an entire gun has the task of seeing all these parts work together. ;)

    Did you know 556/223 ammo is loaded with hardened primers?
    You see. They have designed both the gun and ammo to function a certain way.
    And changes can cause ''self induced'' head scratching problems.

    When you know and can understand how all the parts interrelate. Then have at it!
    Just remember. There is a learning curve. And lessons learned may find you with a non-functioning gun. Just when you need it most. :eek:
     
  15. Tankistheman

    Tankistheman Klamath County Member

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    I do realize that there is a lot to learn. It's just the reason I joined this website before starting the build, so I could get advice from guys like you Medic. I appreciate you taking the time to explain things to me, they probably seem so obvious to you but I'm just beginning in the AR platform. To have these forums is a huge convenience!
     
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  16. v0lcom13sn0w

    v0lcom13sn0w Keizer, or Well-Known Member

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    yep its normal. free float firing pin.
     
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  17. Joe13

    Joe13 NW of Vancouver Opinionated & Blunt Bronze Supporter 2015 Volunteer 2016 Volunteer

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    New to AR's as well - I would have been asking the exact same question so I'm glad someone else found it first.

    Like etrain, I've never chambered a round that I didn't fire.
     
  18. Tankistheman

    Tankistheman Klamath County Member

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    Anything I can do to help Joe haha. Maybe I'm weird but I chamber and don't fire all the time. Every gun in my house is chambered right now, but they never enter the pickup chambered. I just have never liked driving around with a chambered gun.
     
  19. Medic!

    Medic! What just happened? Has eagle eyes. But cant remember what he saw. Bronze Supporter

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    Just so your not down on the AR.
    All my 30 carbines, M1's, M1A's, SKS and AK guns. Have free floating firing pins. And make dents on primers.

    So your in good company. ;)
     
  20. clearconscience

    clearconscience Vancouver, WA Well-Known Member

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    You poor soul.

    If you need someone to take some of that burden off, I'm here for you. That's a lot of firearms to care for.