Page 1 of 2 1 2 LastLast
Results 1 to 10 of 19

Thread: Slamfires

  1. #1

    Default Slamfires

    What is the root cause of a slam fire?

    Reason I ask is that this last weekend I got a whole bunch of unintended double taps I had never got before with a particular lot of ammo I had reloaded. The only difference between then and now is the installation of a Maxim SCS, so that is the prime suspect.

    comments please

  2. #2
    User
    Join Date
    Dec 2012
    Location
    Port Elizabeth
    Posts
    1,562

    Default Re: Slamfires

    Have you touched the trigger group at all?

  3. #3

    Default Re: Slamfires

    Well Theron is on it. Something inside trigger group. Is making the sear slip.
    Or your unintentionally pulling twice.

  4. #4

    Default Re: Slamfires

    Trigger group is a Chip McCormick, never given trouble before...
    So an AR can only fire if the hammer hits the firing pin? IOW the sear is being jarred by the heavy return slam of the CG?

  5. #5
    User
    Join Date
    Jul 2008
    Age
    46
    Posts
    29,307

    Default Re: Slamfires

    A common cause we see of what your describing is bump firing. Were you holding the rifle firmly or did you loosen up a little on your grip?
    Last edited by BigT; 23-05-2017 at 16:26.

  6. #6

    Default Re: Slamfires

    Rifle was firmly held. It happened three times with me and once with my buddy. Looking through other forums it could be:
    Stuck/dirty Firing pin
    High Primer ( I load on a Dillon 550)
    Sensitive primers (I use Winchester SRP)

    looking through the fired brass there were 2 or 3 I noticed have primer strikes that are not deep and indented, they have shallow crater type strikes. Not wondering if these were the slam fire rounds....

  7. #7

    Default Re: Slamfires

    Fairly certain I can rule out high primers as well, just inspected the remaining 300 odd cartridges from that lot and not one high primer to be found. So statistically, that cannot be the cause.

  8. #8
    User
    Join Date
    Dec 2015
    Location
    Eastern Cape
    Posts
    1,028

    Default Re: Slamfires

    Quote Originally Posted by Xkv8r View Post
    Looking through other forums it could be: Stuck/dirty Firing pin..
    FA tech problem as you mentioned. Inspect firing pin and trigger assembly.
    User problem like involuntary squeesing the trigger during recoil. AD or ND could be dangerous

  9. #9
    Moderator SSP's Avatar
    Join Date
    Jul 2008
    Posts
    11,988

    Default Re: Slamfires

    Winchester rifle primers are pretty soft. Had an interesting time with some of their ammo in my LM6. 7 slamfires in a row while trying to shoot them over a chrony.

    It is also possible that the new stock/spring setup that you are running imparts greater return force to the bolt. This, coupled with the primers, may lead to slam fires.

    Try going back to your old stock/spring setup with the same ammo and see what happens.
    Cattle die, kindred die, every man is mortal:
    But I know one thing that never dies,
    the glory of the great dead.
    Havamal

  10. #10
    User
    Join Date
    Oct 2012
    Location
    Durban
    Age
    49
    Posts
    2,575

    Default Re: Slamfires

    The AR has a floating firing pin which strikes the primer on every normal cycle. If you are using soft primers (pistol?) it is quite feasible that cycling could u cause a slam fire.

    Sent from my SM-N920C using Tapatalk

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •