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Thread: AR build light primer strike problem fixed but what caused it?

  1. #11
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    "switching what out"? A light hammer strike is generally caused by a defective hammer spring or incorrectly assembled hammer.

    Did you build this? If so, how much of it did you put together? You should take that ATI crap and throw it in the trash. And an H2 really isn't need for a midlength carbine. it sounds as if part of the problem was failure to go fully into battery. If the weapon is not fully in battery, it will not fire.

    Quote Originally Posted by giabyul View Post
    Yes. It happened more than 20 times. Only on fast double taps. After switching everything out no more problems.



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  2. #12
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    Quote Originally Posted by Iraqgunz View Post
    "switching what out"? A light hammer strike is generally caused by a defective hammer spring or incorrectly assembled hammer.

    Did you build this? If so, how much of it did you put together? You should take that ATI crap and throw it in the trash. And an H2 really isn't need for a midlength carbine. it sounds as if part of the problem was failure to go fully into battery. If the weapon is not fully in battery, it will not fire.
    Whoa there buddy. Maybe you should try and not talk down to people who are trying to learn things. I built the entire thing and no this is not my first build by any means. This is a carbine length gas system. Yes I got rid of the cheap spring. I switched out the receiver extension tube, buffer and spring. I figured out what the problem was. I am just trying to figure out what or why it happened. You know the whole science of it. I used the spring because that was what was available at the time. I have always used the name brand products in the past. I didn't think a spring would cause a problem like it did. So just trying to understand why. Also what spring rates SHOULD be used?

  3. #13
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    Quote Originally Posted by giabyul View Post
    Well I pulled the trigger on a double tap and got a bunch of nothing. Inspected the round and there was a light dimple on the primer. So would that be a light primer strike? I am just trying to figure out exactly what happened and how to prevent it for future builds. Please educate me. I know what parts caused it but I want to know the why.
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    Last edited by .46caliber; 11-29-14 at 22:11.

  4. #14
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    Quote Originally Posted by giabyul View Post
    Whoa there buddy. Maybe you should try and not talk down to people who are trying to learn things. I built the entire thing and no this is not my first build by any means. This is a carbine length gas system. Yes I got rid of the cheap spring. I switched out the receiver extension tube, buffer and spring. I figured out what the problem was. I am just trying to figure out what or why it happened. You know the whole science of it. I used the spring because that was what was available at the time. I have always used the name brand products in the past. I didn't think a spring would cause a problem like it did. So just trying to understand why. Also what spring rates SHOULD be used?
    He's being blunt, not trying to talk down to you. Use a Sprinco White or Quality mil spec spring (BCM, Colt). You probably had a problem with the FCG more specifically the hammer spring if light primer strikes were your problem. The H2 buffer might be to heavy, run a H-buffer and toss the ST-2.
    Last edited by TacticalMark; 11-29-14 at 22:17.

  5. #15
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    I missed the part about carbine gas system, especially since you omitted that from your post. Good luck with your carbine.



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  6. #16
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    Quote Originally Posted by Iraqgunz View Post
    I missed the part about carbine gas system, especially since you omitted that from your post. Good luck with your carbine.
    I didn't know that Daniel defense made a 14.5" mid length gas barrel. Sorry I didn't state it. You know I received some really good replies from a few people and the one person who should have been better wasn't. You are an industry professional and moderator. I really hope that you don't talk to your customers this way. Wow! That is all I have to say. Thank you to all the members who actually gave me information that I can work with.

  7. #17
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    https://danieldefense.com/14-5-5-56m...w-profile.html

    Quote Originally Posted by giabyul View Post
    I didn't know that Daniel defense made a 14.5" mid length gas barrel. Sorry I didn't state it. You know I received some really good replies from a few people and the one person who should have been better wasn't. You are an industry professional and moderator. I really hope that you don't talk to your customers this way. Wow! That is all I have to say. Thank you to all the members who actually gave me information that I can work with.



    Owner/Instructor at Semper Paratus Arms

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

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  8. #18
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    Here's good brief read for future troubleshooting.

    https://www.m4carbine.net/showthread...oning-Now-What



    Owner/Instructor at Semper Paratus Arms

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

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    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  9. #19
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    Exactly. I wasn't aware that the mid length was available. That is why I didn't state it. Secondly I troubleshooted the problem and fixed it. I was just trying to figure out WHY it happened. Thanks for that link that tells me to contact the manufacturer about the problem when I had already fixed it.

  10. #20
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    Quote Originally Posted by Iraqgunz View Post
    "switching what out"? A light hammer strike is generally caused by a defective hammer spring or incorrectly assembled hammer.

    Did you build this? If so, how much of it did you put together? You should take that ATI crap and throw it in the trash. And an H2 really isn't need for a midlength carbine. it sounds as if part of the problem was failure to go fully into battery. If the weapon is not fully in battery, it will not fire.


    I second this. How many guys on here have taken apart an AR to find the hammer spring installed backwards?

    Also, remember that the AR firing pin is free floating and will dimple a primer upon chambering and round/hand cycling.

    OP, so your saying that the buffer spring was swapped out and problem went away? Although I have never personally seen an out of spec buffer spring , I guess I wouldn't rule it out, especially if is acquired from a low quality supplier. Just doesn't seem like that's what was wrong.

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