Broken Bolt Carrier survey | Page 3 | AR15 Forums

Broken Bolt Carrier survey

Discussion in 'AR Talk' started by John A., Mar 4, 2008.

  1. Wild Rice

    Wild Rice Guest

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    With a 16" barrel I prefer a midlength gas system for the longer sight radius, better fore grip, and better visual proportions. Compared to short carbine gas systems, middies are also supposed to have lower peak pressures. Theoretically (at least) middies are gentler on bolts.

    Are there any statistics on carbine vs. midlength broken bolts?
     
  2. mososodbob

    mososodbob Guest

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    I own several ARs in 5.56/.223 for duty as a LEO and a High Power Rifle competitor. I experienced only two incidents of bolt and/or bolt-carrier parts failure (broken parts) over the past 16 plus years of shooting at least 1k of ammo thru each gun.

    #1. Broken gas lug bolt. Colt AR-15 carbine. Failure at around the 5k point. Replaced and re-staked. No issues since. This is one of three duty "long guns" I use for work. About 1-2k rounds per year fired in this gun.

    #2. Broken lug on bolt. M-16 A2 upper. FN parts? Brought from Shurlock as a complete upper while at Camp Perry, circa 1999. Failure after about a case of M198, +/- 1600 rounds. Ordered a replacement from Brownell. No issue since. Roughly 1-2k of ammo per year in this gun as well.

    No issues with my other ARs: Colt A3, Armalite AR15NM, Bushmaster DCM, and a Custom AR Service Rifle built by Derrick Martin (Accuracy Speaks).
     
  3. hardwarz

    hardwarz Guest

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    I have a problem with Shurluk. They say that the are selling FN parts. FN doesn't sell to civilians, only military contracts. OK, so maybe they're selling FN seconds or used parts from DSC. Then they're not new parts you're paying for!

    As far as the OP question, I've never had any bolt carrier break or bolt break on my M16A2 while in the Marines.

    As far as my personal Armalite, I've had to replace the bolt. Turns out it had a bad extractor and the replacement extractor was bad too.

    Hardwarz
     
  4. Bhil671

    Bhil671 Guest

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    Seen people bring all types of ARs up to our private range for about 9 years now - everything from no-name/low-name upper to Stag, Colt, or RRA and everything in between. Seen quite a few malfunctions (usually due to improper assembly or fitment), but I have never seen a bolt or bolt carrier actually crack or break.
     
  5. tomahawk84

    tomahawk84 Guest

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    Im an e5 in the army, unit armorer and the only problems i have come across so far have been 2 brokern extractors. one had the extractor pin break and the other was snapped where the pin goes through. these must have been some really old or really week extractors. these were on FN m16 both serials were off by 5 and we were shooting m855, each rifle had approximatly 600 rounds fired that day. it was messed up like a 1 in a million that they would do this on the same training day.
     
  6. evan1293

    evan1293 Guest

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    I broke a bolt 2 weeks ago on a stag model 2t. This gun has about 4k rounds through it. The break was a hair-line crack around the cam pin hole. I was firing wolf ammo and a spent case got caught in the chamber. I pulled the charging handle back to try to clear the case but it sheared off part of the case rim. Im thinking that when I pulled the charging handle, the stress from the stuck case cracked the bolt.

    FYI...It was difficult to see the crack and if it had not been for the fact that I routinely check that area of the bolt each time I dissassembe the rifle, I would have missed it. Thats a failure prone area so make sure you inspect your bolts when you clean your rifles.
     
  7. Steve-TX

    Steve-TX Guest

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  8. jaco

    jaco Guest

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    Now that is a crack!!!, Steve do you have any more info? Those Colt guys tell us our Stag bolts are not as good. Did you see any small cracks before this major break happened? What was going on when the break occured?
     
  9. Steve-TX

    Steve-TX Guest

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    >>>>>>>
    Now that is a crack!!!, Steve do you have any more info? Those Colt guys tell us our Stag bolts are not as good. Did you see any small cracks before this major break happened? What was going on when the break occured?
    <<<<<<<

    The break down happened yesterday, after only 2 shots on the second magazine of the day, shooting Brown Bear ammo. I did some double taps, but the majority of the shots fired with the 1st magazine were spaced around a second or two between each shot. A friend put in the next magazine, and only got off two shots before the failure.

    A few days before this visit to a friend's camp/range we shot 6 magazines of Brown Bear. All shots were done with a second or two in between them. The last magazine I shot, I dumped 15 rounds as fast as I could, waited a few seconds and then dumped the last 15 in the magazine.

    I have always been real thorough with my cleaning after a day at the range. I never really -closely- inspected the bolt when cleaning, so I can't say I ever saw any cracks before. If I did see any, I sure wouldn't have used the rifle.

    I contacted Stag this AM, after posting here, and spoke with David in customer service. He said the part would be warrantied, and he only requested digital pix of the bolt to get a replacement out to me. I got back a reply from David an hour later stating that a replacement would be sent out ASAP. Stag has been a great to deal with. I noticed on their web site that the bolt is out of stock, so I called David back and asked him if there would be a delay in shipping, and he told me that warranty parts take precedent over sales, and that my warranty bolt would be shipping today!

    I have nothing bad to say about Stag Arms at all. All I can say is: $hit happens!

    I will be buying a spare bolt when they are back in stock though.
     
  10. jaco

    jaco Guest

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    Steve, thanks for taking the time for the reply and sharing your experience. It's good to hear we have a responsible company to back up their product when things go wrong. After all with 6000 rounds you are not just shooting once in a while. I too picked up another BCG knowing as you doo doo can happen, and there is a lot of stress on that part in a AR.
     
  11. gunnut1

    gunnut1 Guest

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    Possibly a squib. I blew up a Springfield XD with a squib. It is impossible to overload a .223 cartridge. And bad powder is doubtful also.
    NOw the wrong powder is a possibility also. Did the gun blow up after a malfunction or did it blow up when you pulled the rigger? In other words, ws there a problem with the previous round? Did the previous round eject properly or did you have to eject it by hand?
     
  12. gunnut1

    gunnut1 Guest

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    Colt pre-ban H-bar. Several thousand rounds thru it. Never had a problem with the blot or carrier.
     
  13. HPD SRT

    HPD SRT Guest

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    Model 1 Sales, Owned about 2 years with a kit rifle I put together for 3 gun. Didn't keep a perfect round count but had to be around 3000 maybe? Shouldn't snap in half I know that much.
    [​IMG]
    [​IMG]
    [​IMG]

    ETA:
    I forgot, this broke during my second to last stage, end of the stage thankfully. Anyway the funny thing is I managed to shoot about 2 or 3 more rounds with it like this, as I thought it was a malfunction and just rolled with it. Obviously I stopped after I inspected and saw half the bolt still in the chamber and the rest of the bcg locked back.
     
    Last edited: Oct 19, 2009
  14. Dan Carey

    Dan Carey Guest

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    Man that looks scary.
     
  15. KEVWYO

    KEVWYO Guest

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    This is pretty wild ... I had my AR go KaBOOM! on me with almost identical damage about 7-8 years ago. I was shooting Federal XM193 ammo.
     
  16. HPD SRT

    HPD SRT Guest

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    Just a little update:

    Even though it's still considered crap still, Model 1 Sales DID send me a free replacement brand new bolt. For backup only now of course...
     
  17. sourpatch45

    sourpatch45 Guest

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    my bolt in my cmmg short barreled rifle has never had any problems, it is the upgraded bolt that cmmg offerers and is in a m16 carrier

    i only have about 1000 rounds through it so the long term reliability is unknown at this point
     
  18. aiformula

    aiformula Guest

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    I have 2 AR's and I've run about 4k rds of 10mm through one and am closing in on 12k rounds of 223 in the other. And sometime this summer I will likely be doing a TDI carbine class with is which will add 1800 or so rounds in one weekend so we'll see.
     
  19. mvician

    mvician Guest

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  20. TBAG809

    TBAG809 Guest

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    My Bushmaster Bolt Carrier gas key came loose yesterday at the range. I was shooting Federal XM193. Gun is 9 years old and has approximately 2500 rounds through it. Key was not properly staked. I put some loctite on the screws and re-tightened them. I re-staked using flat head screw driver, hammer and vice. Keeping as a backup and ordered a Bravo Company BCG.

    I also have an M&P15T with about 2000 rnds and no problems so far. Gas key is properly staked.
     

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