View Poll Results: Round count and bolt failures with mid-length gas systems.

Voters
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  • Bolt failed under 2,500 rounds

    4 4.26%
  • Bolt failed under 5,000 rounds

    2 2.13%
  • Over 5,000 rounds with no bolt failure

    56 59.57%
  • Bolt failed under 10,000 rounds

    3 3.19%
  • Over 10,000 rounds with no bolt failure

    17 18.09%
  • Bolt failed under 15,000 rounds

    0 0%
  • Over 15,000 rounds with no bolt failure

    2 2.13%
  • Bolt failed under 20,000 rounds

    0 0%
  • Over 20,000 rounds with no bolt failure

    6 6.38%
  • Bolt failed: unknown number of rounds

    4 4.26%
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Thread: Who has broken a bolt with a mid-length gas system?

  1. #21
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    Re: Who has broken a bolt with a mid-length gas system?

    Soooo, if you get enough data and middie bolts are lasting 20k rounds, are you just going to go ahead and make the E3 bolt lifetime warrantied?

  2. #22
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    Quote Originally Posted by mtdawg169 View Post
    Soooo, if you get enough data and middie bolts are lasting 20k rounds, are you just going to go ahead and make the E3 bolt lifetime warrantied?


    This is just for general info, no connection with my day-job.

    The middie thing comes up often, and a pretty common and acute criticism is: where's the data regarding increased lifespan to support that claim?
    I know that there are dudes that have run middies for a while now, and I consider 20k to be an upper limit of expectation, as by that time the barrel is most likely shot-out.
    Jack Leuba
    Director of Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  3. #23
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    Edited the poll to hopefully open up some more responses
    Jack Leuba
    Director of Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  4. #24
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    Once I win the next Powerball (of if that old hag sends me money) I will get another middy and shoot the piss out of it. Unfortunately I have been shooting too much carbine, SBR and rifle stuff.

    I can't remember the last time I actually owned a midlength........

    Quote Originally Posted by Failure2Stop View Post
    Edited the poll to hopefully open up some more responses



    Owner/Instructor at Semper Paratus Arms

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  5. #25
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    Re: Who has broken a bolt with a mid-length gas system?

    Quote Originally Posted by Failure2Stop View Post


    This is just for general info, no connection with my day-job.

    The middie thing comes up often, and a pretty common and acute criticism is: where's the data regarding increased lifespan to support that claim?
    I know that there are dudes that have run middies for a while now, and I consider 20k to be an upper limit of expectation, as by that time the barrel is most likely shot-out.
    Roger that, just kidding around. The reasoning behind the poll is sound & I'm very curious to see the results. Unfortunately, finding folks that have put enough rounds through a single sample is probably going to be tough.

  6. #26
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    I have a BCM BFH 16" Mid-Length with a little over 10,000 rounds through it without a bolt failure. I clean and inspect it after every shooting session and so far no cracks or breaks.

  7. #27
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    I can't comment yet because I only have a few thousand rounds through my mid length with DD chromed BCG. If ammo wern't so damned expensive, or I was being paid to shoot it, I certainly would have more brass collected. I'll post when the darned thing breaks.
    -Thomas

    Member, ISRA; Life Member, NRA; USCCA Certified Instructor; NRA Certified Instructor, AGI Certified Gunsmith, Illinois Concealed Carry Instructor
    www.alphakoncepts.com www.gunrights4illinois.com

  8. #28
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    Quote Originally Posted by Robb Jensen View Post
    Armalite whole guns made during the Federal AWB, clamp on FSB. All bolts failed in less than 5K rounds.
    so this was the "deprecated" lug pattern?..
    never push a wrench...

  9. #29
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    KAC built 16" Midlength (Armalite style middy gas 1:7 Wylde Chambered Douglas SS barrel)



    I had over 18k thru it -- using LMT Improved Bolt.
    Used in Canada, US, Afghan and Iraq.
    Sold it as it could not leave Iraq - buddy who got it put another 5k before the barrel was utterly toast, bolt did not fail.
    Had a spare Colt M4 bolt in the MIAD, but never needed.

    Ammo used
    Swiss GP90 (3,000)
    CF issue C77 ball (3,500)
    HandLoad 75gr (500)
    Handload 77gr Nosler (750)
    Georgia Heat 55gr (5,500)
    Federal GM 69gr (1,500)
    M855 (1,500)
    Mk262 Mod0 and Mod1 (2,500)
    M995 AP (aprox 75 rds)

    Most was shot semi-auto, however around 14 mags where fired auto back to back out the back of our CAT vehicle (GPMG went down hard) and 2 mags of Mk262 where fired auto for function testing when I got a bunch of it available.

    20 rds of M995 where fired for function (delinked SAW Black belts), and 2 28rd mags where fired after.

    Big Red's LT 16" middy Stealth had around 12k thru it IIRC, before he opted for M79 and Mk18
    Kevin S. Boland
    Manager, Federal Sales
    FN America, LLC
    Office: 703.288.3500 x181 | Mobile: 407-451-4544 | Fax: 703.288.4505
    www.fnhusa.com

  10. #30
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    Quote Originally Posted by Robb Jensen View Post
    Armalite whole guns made during the Federal AWB, clamp on FSB. All bolts failed in less than 5K rounds.
    I would tend to blame that on garbage in, garbage out.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

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