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Thread: LMT Enhanced BCG - Full Auto or Semi and Other Question

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  1. #1
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    LMT Enhanced BCG - Full Auto or Semi and Other Question

    I'm considering the purchase of the LMT Enhanced BCG to upgrade the stock BCG on a Colt SOCOM - 14" barrel, etc. But I was confused by the option of choosing a full auto over a Semi? I should mention that I am planning on a suppressor for it and wondering if that makes any difference or would impact my choice.

    More generally, let me also ask if a LMT Enhanced BCG is a wise move to assure additional reliability of the M4?

    Thanks.

  2. #2
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    What do you mean by "to ensure additional reliability"? Are you having problems with the Colt bcg?
    Last edited by Five_Point_Five_Six; 11-05-18 at 09:00.

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    Get the "full auto" M16 version. There's no reason to go with the "semi auto" AR15 version.

  4. #4
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    LMT Enhanced BCG - Full Auto or Semi and Other Question

    Quote Originally Posted by 556Cliff View Post
    Get the "full auto" M16 version. There's no reason to go with the "semi auto" AR15 version.
    This. Because I think the extra weight is a good thing. But I’ve never weighed them both to see the weight delta. Also, I’m. Not sure if the BCG’s have changed since this time.
    I’m pretty sure a couple of years ago LMT specifically said the enhanced BCG (with enhanced bolt) was meant to improve reliability on longer barrel AR’s. I think that barrel length was 16”. Robb says you don’t need it until your running 14.5 or greater and FA. But you can read that for yourself. Always search the forums. It’s possible to come up with an original inquirer based on a new product but for age-old questions like yours - there will probably be a thread to two.

    There is some time and effort spent in developing that BCG. I use the enhanced carrier and standard or Sionics bolt in my SBR’s.

    However did you search M4C??

    If you didn’t your question is addressed here:
    https://www.m4carbine.net/showthread...-full-auto-BCG


    https://www.m4carbine.net/showthread...to-vs-semi-BCG




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    Last edited by RobertTheTexan; 11-05-18 at 09:39. Reason: My English of course
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  5. #5
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    I have an M4A1 SOCOM. I have an LMT enhanced BCG.

    You MIGHT see a small improvement by installing the LMT. You might not.

    Having put both the SOCOM and the LMT BCG through their paces, I would not put an LMT BCG in the SOCOM. The SOCOM doesn't need it.

    If you did put the LMT BCG in the SOCOM, you would also need to adjust the gas port to see any advantage the LMT BCG would give you.

    Take the money you would spend on the new carrier, buy ammo and go shoot it up this weekend on Veteran's Day.
    The number of folks on my Full Of Shit list grows everyday

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  6. #6
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    Quote Originally Posted by RobertTheTexan View Post
    This. Because I think the extra weight is a good thing. But I’ve never weighed them both to see the weight delta. Also, I’m. Not sure if the BCG’s have changed since this time.
    I’m pretty sure a couple of years ago LMT specifically said the enhanced BCG (with enhanced bolt) was meant to improve reliability on longer barrel AR’s. I think that barrel length was 16”. Robb says you don’t need it until your running 14.5 or greater and FA. But you can read that for yourself. Always search the forums. It’s possible to come up with an original inquirer based on a new product but for age-old questions like yours - there will probably be a thread to two.

    There is some time and effort spent in developing that BCG. I use the enhanced carrier and standard or Sionics bolt in my SBR’s.

    However did you search M4C??

    If you didn’t your question is addressed here:
    https://www.m4carbine.net/showthread...-full-auto-BCG


    https://www.m4carbine.net/showthread...to-vs-semi-BCG




    Sent from my iPhone using Tapatalk
    It was meant specifically to help with the early unlocking and excess bolt velocity issues inherent to the M4 carbine gas system. The LMT enhanced bolt has an elongated cam path to delay unlocking for better extraction and an additional and relocated gas vent to blow out more gasses out the carrier. Running suppressed on a 14.5" carbine barrel is a less than ideal configuration so both of these modifications will definitely benefit the OP's rifle.

    Unsuppressed the gains the pretty marginal but for the suppressed use it would definitely help. Better yet would be to use a midlength gas system with a small gas port.
    Last edited by vicious_cb; 11-09-18 at 00:10.

  7. #7
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    Quote Originally Posted by FredL View Post
    I'm considering the purchase of the LMT Enhanced BCG to upgrade the stock BCG on a Colt SOCOM - 14" barrel, etc. But I was confused by the option of choosing a full auto over a Semi? I should mention that I am planning on a suppressor for it and wondering if that makes any difference or would impact my choice.

    More generally, let me also ask if a LMT Enhanced BCG is a wise move to assure additional reliability of the M4?

    Thanks.
    Before I get into LMT, if you are not opposed to spending $330, then maybe look at the new Surefire bolt/carrier kit:
    https://www.surefire.com/optimized-b...oup-556mm.html
    https://www.opticsplanet.com/surefir...er-system.html

    I have a few LMT E-BCGs but I am not an expert. I ended up with both a Full and Semi. And they weigh almost the same, I think. My S/A was 9.00oz but I cant find what my F/A weighs. If you are buying new, then get the full auto.

    Remember this is a system, if you add the LMT enhanced carrier you will need to address the faster bolt speed. If you add the e-carrier AND suppress, then you are adding 2 things to speed up the carrier. The faster carrier speed caught me out, I thought years ago that it slowed the carrier.

    I use them on suppressed setups with heavy buffers. One has an adjustable gas block 11.5 and the other 12.5, has a smallish port.

  8. #8
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    I have a Colt M4A1 F/A for 10 years and thousands of rounds and have never had a failure. Not sure why you would spend additional funds.

  9. #9
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    For your application, the LMT E-Carrier Group isn't going to do much.



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  10. #10
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    What’s wrong with the Colt BCG? The answer is nothing. You’re literally wasting money. Spend that on ammo, optics, mags, or training.

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