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Thread: Bolt Failure today..

  1. #11
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    Quote Originally Posted by WS6 View Post
    Early M4A1's...
    Was there a change made, or did you stop shooting them, or...?
    They were early deliveries, not recent. I think they were 98-01 vintage. Car buffers, original extractor spring buffers.

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  2. #12
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    Yep - my feeling is that 5,000 is the top side for bolt life, and less for a suppressed or machine gun. I'm pretty sure it's even written somewhere.

    I've replaced bolts at around 5k in the past. I've since stopped maintaining a replacement schedule or even really keeping round counts, but this is a reminder that it should probably be maintained with a designated hostility gun, at least. Training/fun guns can be ridden to failure without much consequence, obviously.

  3. #13
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    Quote Originally Posted by Dead Man View Post
    Yep - my feeling is that 5,000 is the top side for bolt life, and less for a suppressed or machine gun. I'm pretty sure it's even written somewhere.

    I've replaced bolts at around 5k in the past. I've since stopped maintaining a replacement schedule or even really keeping round counts, but this is a reminder that it should probably be maintained with a designated hostility gun, at least. Training/fun guns can be ridden to failure without much consequence, obviously.
    Yup.
    I've seen mil bolts fail at under 4k, and some go over 8k. Replace at 5k and keep a spare handy.

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  4. #14
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    Quote Originally Posted by Failure2Stop View Post
    They were early deliveries, not recent. I think they were 98-01 vintage. Car buffers, original extractor spring buffers.

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    Oh, significant suppressed fire on those A1s.

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  5. #15
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    What's interesting is many of my bolts have almost double the mileage and are still fine. This includes the ones on my 11.5" and 12.5" uppers which are shot suppressed.

    Of course, I know the pedigree of all of them.



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  6. #16
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    Quote Originally Posted by Iraqgunz View Post
    What's interesting is many of my bolts have almost double the mileage and are still fine. This includes the ones on my 11.5" and 12.5" uppers which are shot suppressed.

    Of course, I know the pedigree of all of them.
    Those were also from the days of less than optimal lubricant application.

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  7. #17
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    Did it lock up again after the 40 additional rounds, or did you just decide to stop shooting at that point?

  8. #18
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    How much you selling it for ? It could yield a cool paper weight in the office, specially since it was celebrity shot , just sign it first. What do you gents consider on the low end of mileage for a quality BCG, high end? I am under the understanding that shooting suppressed will lower the BCG life, but is there a rule of thumb of about how much?

    Grammar is not really my thing today I have a lot going on, I hope my question/ comment makes sense. It's something I often wondered.


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  9. #19
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    Quote Originally Posted by Failure2Stop View Post
    Yup.
    I've seen mil bolts fail at under 4k, and some go over 8k. Replace at 5k and keep a spare handy.

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    With a 16" barreled semi-automatic sans suppressor, should we expect a much longer bolt life?
    Train 2 Win

  10. #20
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    Quote Originally Posted by markm View Post
    Not EXACTLY sure. I'd estimate 2000-4000 rounds. This bolt is NP3'd and bought that way, but hasn't appeared so since about 100 rounds or so. I'm not sure I want to say what bolt it is yet. This is my first busted bolt, and I don't think it's anything other than SHIT HAPPENS. This is NOT A BCM or COLT item.
    Mark how wet did you keep the bolt? Wondering if that had anything to do with it.

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