Light primer strike closing BCG

db2000

db2000

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    • Mar 27, 2020
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    4,808
    #1
    What appears to be a very light firing pin strike when closing the bolt on 25 CM AR10. Any advice?

    Seekins SP10, Seekins BCG w/ JP HP bolt and matched HP firing pin. 205M primers and Alpha SRP brass x 2 firings.

    Before and after racking into chamber via bolt catch release from mag.
    IMG_0996.jpeg

    IMG_0995.jpeg


    IMG_1001.jpeg
     
    #4
    In an ar the firing pin floats freely and just gets whacked by a hammer forward hard when the trigger is pulled.
    So when the bolt slams closed chambering a round the pin naturally slams forward with it making a little dent. Thin weak primers can get set off in what’s called a slam fire. The thicker stronger primers with more anvil clearance are designed to mitigate the risks of a slam fire.
     
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    #5
    spife7980 said:
    In an ar the firing pin floats freely and just gets whacked by a hammer forward hard when the trigger is pulled.
    So when the bolt slams closed chambering a round the pin naturally slams forward with it making a little dent. Thin weak primers can get set off in what’s called a slam fire. The thicker stronger primers with more anvil clearance are designed to mitigate the risks of a slam fire.
    Click to expand...
    Yeah, this confirms what I thought because it’s worrisome to see the mark. I’ve certainly not noticed it on my other ARs. It’s a new bolt and pin from JP. Thanks.
     
    #7
    db2000 said:
    Yeah, this confirms what I thought because it’s worrisome to see the mark. I’ve certainly not noticed it on my other ARs. It’s a new bolt and pin from JP. Thanks.
    Click to expand...
    Research the raison d' etre of the .mil spec primers (41/34/GMAR) etc IIRC... they all nexist specifically for "reasons"...
     
    #8
    ma smith said:
    Research the raison d' etre of the .mil spec primers (41/34/GMAR) etc IIRC... they all nexist specifically for "reasons"...
    Click to expand...
    I appreciate it. I’m familiar with the 41 & 34 just didn’t think they were necessary unless potentially dropping the rifle on the butt. I’ve read arguments on here for and against. Frankly, never noticed the pin making a mark before by just dropping the BCG and really haven’t felt I needed them. Certainly considering it now.
    I posted mainly to make sure there was another issue I might be overlooking. Thanks.
     
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