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Thread: Critical Failure - Seeking Advice

  1. #11
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    @awpk03s

    Where did you stumble upon that Mossberg barrel? I didn't realize they were selling parts...

  2. #12
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    Quote Originally Posted by MK18Pilot View Post
    @awpk03s

    Where did you stumble upon that Mossberg barrel? I didn't realize they were selling parts...
    http://www.aimsurplus.com/product.as...el&groupid=573

    Picked it up a couple months ago.

  3. #13
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    Quote Originally Posted by awpk03s View Post
    Aim's tagline is problematic for me... 15 Years of Surplus. You?

    I'd still suggest performing a thorough visual inspection on the barrel extension and have someone check run out on it in several locations.

    Properly verifying headspace isn't as easy as owning a gage. Barrel manufacturers should use a master bolt, a gage itself, with the headspace gage to verify chamber dimensions. Use of an off-the-shelf bolt to check headspace will only tell you there is a dimensional issue. The question now is whether it's the bolt or barrel assembly. With no way to eliminate the bolt, the tendancy is to assumes it's the barrel assembly.

    Sinister - Is there any chance that an unsupported cartridge could just as likely be the result of an excessive dimension (circumference) at the rear of the chamber and have no effect headspace?
    Last edited by MarkG; 07-06-13 at 16:20.

  4. #14
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    Is this a headspace issue or an out of battery condition?
    Black River Tactical
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  5. #15
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    If it were excessive chamfering at the base of the chamber or out-of-battery you'd see the case expanded around the entire circumference.

    To check headpsace there are three gages: GO, NO-GO, and FIELD.

    GO is obvious. NO-GO is at the maximum limit of safe (if the bolt both locks and closes) headspace.

    If a bolt locks and closes on a FIELD gage the weapon is UNSAFE TO USE OR FIRE.

    Either component (the barrel and extension, or the bolt) may be at maximum manufacturer drawing limits. Stacking two components at max may lead to excessive and unsafe headspace.

    Headspace is the distance from the base to a datum line on the shoulder, NOT the gap between the bolt face and front of the lugs and the base of the barrel.

  6. #16
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    Critical Failure - Seeking Advice

    OP, happy to send you a free field gauge (mentioned above by sinister) for you to check your carbines with...hell keep it if you want.

    I do what sinister advised; check every barrel prior to use. BCM, FN, Noveske, Colt, Douglas, and DD have all checked out. My luck, the day I forgot is the day I'm in your shoes. Glad you weren't hurt.
    Last edited by munch520; 07-06-13 at 18:54.

  7. #17
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    The ammo is the problem here. Just a few days ago my SBR blew up. The barrel was a BCM 12.5" w/an LMT enhanced carrier and BCM bolt. Upper had about 8K through it and had functioned 100% without issue.

    The ammo was some remanufactured stuff that was supposed to be good to go. Unfortunately it wasn't. The carrier split at the bottom, extractor was trashed and the upper was bulged. I haven't been able to inspect the barrel yet.

    My round looked almost identical to yours.



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  8. #18
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    Rubber City Armory....

  9. #19
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    Critical Failure - Seeking Advice

    Quote Originally Posted by Iraqgunz View Post
    The ammo is the problem here. Just a few days ago my SBR blew up. The barrel was a BCM 12.5" w/an LMT enhanced carrier and BCM bolt. Upper had about 8K through it and had functioned 100% without issue.

    The ammo was some remanufactured stuff that was supposed to be good to go. Unfortunately it wasn't. The carrier split at the bottom, extractor was trashed and the upper was bulged. I haven't been able to inspect the barrel yet.

    My round looked almost identical to yours.
    Holy shit, you good?

  10. #20
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    Quote Originally Posted by Iraqgunz View Post
    The ammo is the problem here. Just a few days ago my SBR blew up. The barrel was a BCM 12.5" w/an LMT enhanced carrier and BCM bolt. Upper had about 8K through it and had functioned 100% without issue.

    The ammo was some remanufactured stuff that was supposed to be good to go. Unfortunately it wasn't. The carrier split at the bottom, extractor was trashed and the upper was bulged. I haven't been able to inspect the barrel yet.

    My round looked almost identical to yours.
    SBR? I double hope your lower is fully intact Gunz.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

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