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Thread: LMT and Black Hills problems

  1. #11
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    Doesn't impress me as an ammo problem first. LMT isn't one of the usual suspects, either. Any "improvements" or mods to the gun? More info/diagnosis required here.
    No, this gun has not been modified. It is factory LMT all the way, nothing has been touched except for fieldstripping for cleaning.

    I just thought it unusual that the blue box BH hung up in the magazine when the bolt tried to pick it up and chamber it. I had to retract the bolt and drop it a second time to get the round to feed. Seemed a bit...unusual...

    Plus, the couple of light primer strikes made me wonder if there was an issue with the ammo or the gun...but, like I said, the rifle functioned flawlessly with UMC 55 grn FMJ...

    And, no, I'm not going to send it in...I appreciate that ya'll have had great experience's with BH customer service, though. I'm going to keep the rest as a sample, and likely will not purchase any BH blue box .223 in the future unless they improve. I'm going to wait until I get a micrometer to do some measurements about the length and such...

    I'd still like to hear if anyone else has had similar problems...

  2. #12
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    I have had "issues" with BH Blue Box (Remanufactured. Red is new, white is Mk262). My issues are ONLY failure of the bolt to lock to the rear on an empty magazine (PMAG, rested, benched, and free), from a BCM upper.
    As I understand, the blue box is loaded to SAAMI pressure, not NATO, to which I attritibuted the issues. Either way, blue-box is not my go-to ammo, just a training supplement, as I got it for a great price.
    If you are concerned about the performance of your weapon, get some NATO pressure ammo (M855, M193, Mk262, or 5.56 TAP) and try it. LMT is known to assume that you will be feeding higher pressure ammo, and drills it's gas ports accordingly.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  3. #13
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    If you are concerned about the performance of your weapon, get some NATO pressure ammo (M855, M193, Mk262, or 5.56 TAP) and try it. LMT is known to assume that you will be feeding higher pressure ammo, and drills it's gas ports accordingly.
    I didn't have a problem with firing, extraction, or the bolt locking back on the last round...it was just feeding on the initial charging, and the light primer strikes...

  4. #14
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    I have shot over 3000 rounds of Black Hills blue box 75 grain in my 9 AR's and never had any FTF or FTE problems what so ever . runs smooth ,very accurate,and hits hard . my Colt 6724 loves them and I get .75 moa at 100 yards all day .
    WHO ME ? ---- A government big enough to
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  5. #15
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    I've run ~2500 rounds of BH blue box 55gr ammo through my Colt 6920 and Noveske N4 build without issue. Never checked my ammo for length, but I had the following three samples on hand and thought I'd snap a pic:



    It does look like the case on the BH is longer than the other two, but my rifles don't seem to mind. I'd consider trying at least one more box of BH 55gr (maybe purchased from a different source) to see if maybe the box you had was bad.

  6. #16
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    Since it's a brand new rifle, do you have any lube dripping out of mag well? If not make sure you lube the heck out of it first and try again.

  7. #17
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    Headspace check

    Quote Originally Posted by lindertw View Post
    I've run ~2500 rounds of BH blue box 55gr ammo through my Colt 6920 and Noveske N4 build without issue. Never checked my ammo for length, but I had the following three samples on hand and thought I'd snap a pic:



    It does look like the case on the BH is longer than the other two, but my rifles don't seem to mind. I'd consider trying at least one more box of BH 55gr (maybe purchased from a different source) to see if maybe the box you had was bad.
    It would be pretty simple for people who think their Ammo. is too long in their ARs chambers to check the headspace with a field grade gage. If they can lock in the carrier then there is a headspace problem with that round of Ammo.

  8. #18
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    Quote Originally Posted by Failure2Stop View Post
    I have had "issues" with BH Blue Box (Remanufactured. Red is new, white is Mk262).
    Factory seconds, both new and reman seconds, come in white boxes. Not unique to Mk262, or even .223.

    As I understand, the blue box is loaded to SAAMI pressure, not NATO,
    That's correct.
    2012 National Zumba Endurance Champion
    الدهون القاع الفتيات لك جعل العالم هزاز جولة الذهاب

  9. #19
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    Lindertw's pic is quite interesting...

    As I understand, the blue box is loaded to SAAMI pressure, not NATO,
    NATO pressure for 5.56 is higher than your standard commercial .223 pressure ammo, but the pressure of the ammo is not causing problems...I'm going to be putting BH ammo in the practice ammo category from now own, though...

    Don't see much BH ammo around here, though...and, I am not ordering from the internet...no credit card, and I prefer to buy by the box...

    Once I get next week's paycheck, I will be hitting the gunshops to pick up more mags and as many types of 55grn and heavier ammo I can find for testing...

    Since it's a brand new rifle, do you have any lube dripping out of mag well? If not make sure you lube the heck out of it first and try again.
    Yes, I run her wet. I'm not having a serious problem, no jamming or anything, but just some disturbing stuff with what I thought was considered to be top-quality ammo...I'm just trying to trace down some causes and see if anyone else has had some issues with BH ammo like I had...

  10. #20
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    FWIW, my LMT 16" loved the 55 grain blue box, which was also purchased long ago. 100 rounds without a hiccup... Also, BH 77 grain Mk 262 fed and grouped wonderfully.

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