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Thread: Failures to extract: Enhanced BCG and DD V7

  1. #51
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    Failures to extract: Enhanced BCG and DD V7

    The LMT enhanced bolt has a different extractor pivot location compared to the KAC E3 bolt. The KAC has more mechanical advantage.
    I use the LMT enhanced carriers in some lightly gassed guns with extended gas systems with great success. I also use them in harder gassed guns with shorter gas systems with success. All of those guns functioned with standard M16 BCGs. The LMT enhanced carriers just helped with some specific things I wanted to address.
    Last edited by tom12.7; 10-24-13 at 15:53.

  2. #52
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    Quote Originally Posted by DreadPirateMoyer View Post
    A few people in this thread are criticizing along with implications of ignorance; you can scroll through and see them, but either way, that's not really the point. The point is he's probably got a turd bolt and he needs to test it with a DD BCG to confirm.

    I've read this forum front to back on the LMT enhanced BCG before installing it within all my rifles and didn't see any reports showing it induced malfunctions in non-SBRs that were working well. Would you be able to link them to me? I may have missed them because I suck at the search button. I mean that in all honesty, too. I have a lot of experience with them, but I could always learn more if I didn't come across something.
    Grant's SBR Thread, page 15, these three quotes are taken in order so read them all together.

    Quote Originally Posted by C4IGrant View Post
    I have run the enhanced carrier in TONS of SBR's. It has fixed lots of problems when guns are shot suppressed.

    The bolt has almost never worked for me.



    C4
    Quote Originally Posted by og556 View Post
    Grant,

    What issues have you had with the enhanced LMT bolt ? Have you experienced those same issues in non SBR's such as 16" mid length carbines ?
    Quote Originally Posted by C4IGrant View Post
    They didn't work.

    I have never really had any luck with them in any gun, but I am sure some have.


    C4
    I realize this isn't a specific instance like you asked for, but to me it says a lot when someone with Grant's level of experience in assembling guns that work and diagnosing/fixing guns that don't says he has never had any luck with the enhanced bolt in any gun.
    Last edited by SteveL; 10-24-13 at 16:12.
    Steve

  3. #53
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    Quote Originally Posted by Redbeardsong View Post
    I still don't understand why the OP felt the need to "upgrade" to the LMT enhanced BCG. Daniel Defense builds rifles that just plain run reliably.
    As I stated in the OP, I had a brand new, quality, $280 BCG sitting there that is a little easier to clean. i.e. it's already paid for and in my possession. Why not? It'll get ironed out eventually. The DD has now been wrapped in a ziplock after a dunk in EWL for future use (well, soon to be for an extraction test).
    11C2P '83-'87
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  4. #54
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    Quote Originally Posted by WS6 View Post
    It enhanced it right into the junk pile, IMO.

    OP: Try the factory DD BCG and report back how it does, please. I'm dying to know...
    As I said earlier it might be next week at the earliest (work and all) before I get a chance to do it.
    11C2P '83-'87
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  5. #55
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    Quote Originally Posted by DreadPirateMoyer View Post
    Yeesh, guys, a bit traditionalist? Are you really criticizing someone for trying to make an already-reliable rifle even better with some parts swaps? To be honest, I find the whole "Why would you try to upgrade a reliable rifle?!" philosophy pretty ridiculous.

    Why swap an A2 flash hider for a Smith Vortex or Surefire 3P flash hider then? Why swap a carbine-length RE for an A5 system? Why swap a mil-spec trigger for a Geissele SSA? Why swap an aluminum magazine for a PMAG? Why swap something that's already reliable for something else?

    Because it makes the gun even better. The LMT enhanced bolt carrier does that in carbine and mid-length gas systems, just like an SSA or a PMAG or an A5 buffer system. The bolt does too. From all of the research and data posted on the LMT enhanced BCG, this issue has nothing to do with him swapping in the BCG and everything to do with a lemon, which all manufacturers make from time to time.

    Can we stop the dogpile until the OP gets a new bolt (and reproduces the malfunction)? Or could someone post direct evidence of a consistent history of properly-functioning LMT enhanced BCGs causing issues in carbines and midlengths?

    Dear Lord. I'm glad you guys weren't around when PMAGs were introduced. This isn't just mindless tinkering. Putting in the LMT enhanced BCG can cause marked improvements in a gun's function and longevity. OP tried to do that. It was rational and reasonable.

    ETA: please let us know how the gun runs with the DD BCG. If it runs fine, I'd ask that LMT replace the whole bolt. It's probably the extractor, but could also be the springs, some weird tolerance issue, or any other number of things. Getting a whole new bolt will be the only way to get rid of all the possible variables and start fresh.

    Thanks, excellent rebuttal.

    And yeah, if it extracts fine with the standard BCG I'm going to ask for the entire bolt to be replaced. As you said it *could* (and likely is) the extractor but if some tolerances were improperly machined into the bolt affecting the way the extractor sits then I'd just as soon be safe and replace the whole damn thing.
    Last edited by ABNAK; 10-24-13 at 16:37.
    11C2P '83-'87
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  6. #56
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    Thought I'd update. Went out today and popped off 60rds with another BCG installed. No failures to extract (or any other malfunctions either). That is the approximate number I fired before and had 4 failures to extract.

    Looks like I'll be calling LMT tomorrow about sending the Enhanced bolt back, unless they want the whole BCG. They had said when I spoke to them previously that if I had success with another bolt that meant the Enhanced one was the likely culprit and they'd replace it.
    11C2P '83-'87
    Airborne Infantry

  7. #57
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    I'd still try out the LMT enhanced carrier with the standard bolt. That combo should be good to go.

  8. #58
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    You said you have a spare extractor for the Enhanced Bolt? Is it really that hard to swap it and try that one?
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

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    I'd at least break it in before I started swapping core components so you (as someone mentioned earlier) have a performance baseline. My V7LW has run flawlessly since I bought it (thanks M4Carbine.net).

  10. #60
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    Quote Originally Posted by Heavy Metal View Post
    You said you have a spare extractor for the Enhanced Bolt? Is it really that hard to swap it and try that one?

    Meh, I'll just save it and take them up on their offer of replacing the whole bolt. That way I'll still have a spare extractor.

    FWIW the BCG I used was another Enhanced one I've had for a year or two now in stash. Must be a previous Gen than the problematic one as the bolt lug relief cuts are to the rear of the lug as opposed to the center like it is now. No matter, it worked fine. It will stay in this weapon.
    11C2P '83-'87
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