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Thread: LMT Enhanced bolt

  1. #41
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    Quote Originally Posted by Magic_Salad0892 View Post
    What I meant was, maybe the smaller port, and enhanced carrier would slow the bolt down enough to work.
    The smaller gas port already slows the carrier down.
    If the gas port is too small, the upper already won't function.
    Going to an LMT enhanced carrier would slow the carrier down even more, not allowing enough energy to transfer to the carrier before the bullet leaves the muzzle.
    That would just about guarantee non-function.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  2. #42
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    Quote Originally Posted by eperk View Post
    I have the enhanced bolt in a standard LMT carrier. My only worry is where to get the replacement springs.
    Didn't see them in the LMT store.
    Anybody have any ideas of a suitable substitute if the originals can't be found?
    I have spare springs and extractors for LMT enhanced bolts.
    Any LMT dealer can order them along with a larger order but LMT just won't sell them as individual parts unless you order 100 pieces.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  3. #43
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    Randall,

    At first thought one would think that would be the case but in the ultimate SBR thread it worked the opposite IIRC.

    I think it was the revised cam tunnel timing that made it function.
    Last edited by EzGoingKev; 12-08-12 at 18:07.

  4. #44
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    Quote Originally Posted by EzGoingKev View Post
    Randall,

    At first thought one would think that would be the case but in the ultimate SBR thread it worked the opposite IIRC.

    I think it was the revised cam tunnel timing that made it function.
    Interesting.
    I don't have SBR's due to my lame state laws, but what specific barrel lengths and gas port locations and gas port diameters were we talking about here?
    I would assume the most common SBR AR's to be 10.5" carbine gassed setups unless someone states different.
    Last edited by AR15barrels; 12-08-12 at 18:55.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  5. #45
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    I cannot find it but there is/was a huge "ultimate SBR" thread in which Grant (IIRC) outlined an SBR build for himself.

    As I said, I cannot find it so I am going from memory but it was a 11.5" or 12.5" barrelled SBR that he shoots both suppressed and un-suppressed with the goal of using the smallest gas port.

    The rifle functioned with the suppressor but would not cycle the action 100% when the suppressor was removed. A LMT enhanced bolt carrier was installed and fixed the problem.

  6. #46
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    Quote Originally Posted by Iraqgunz View Post
    I have an enhanced carrier and I am now tempted to remove the key and look at it. Another thing I noticed about the extractor springs (if someone knows the answer please tell) the springs appear to be a standard ejector spring that was essentially cut down. Basically the length of them was about 1/3 the size of an ejector spring in length.

    I need to get access to another one to examine it.
    I can telly you one thing, they waaaay outlast the standard extractor springs.

    I bought a sackful at a buck per spring and have never needed one. The biggest danger would be losing one.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  7. #47
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    This is what I was told when I asked them why they were so much more expensive then other bolts. I was told it would last several thousands of rounds more than most other bolts.

    Quote Originally Posted by Heavy Metal View Post
    Word is that the bolt is made of Aermet which some say is 2.5 times stronger than Carpenter 158 series steel. (Both are form Carepenter)

    Also, two more points:

    1.) The springs just last and last. I am well over 10K rounds and the springs are still happy and strong.

    2) The carrier kely on mine came loose arond 14K rounds(only realy gripe to date). Upon removal prior to re-tightening it, I discovered somthing unusual, the gas hole into the carrier from the key had a divider in it, it was bifrucated.

  8. #48
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    Quote Originally Posted by EzGoingKev View Post
    I cannot find it but there is/was a huge "ultimate SBR" thread in which Grant (IIRC) outlined an SBR build for himself.

    As I said, I cannot find it so I am going from memory but it was a 11.5" or 12.5" barrelled SBR that he shoots both suppressed and un-suppressed with the goal of using the smallest gas port.

    The rifle functioned with the suppressor but would not cycle the action 100% when the suppressor was removed. A LMT enhanced bolt carrier was installed and fixed the problem.
    Here it is. Got this bookmarked, so if I ever get out of Jersey, I can have some fun with this.

    https://www.m4carbine.net/showthread...ferrerid=48468

  9. #49
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    I know LWRC sells extractor springs with inserts for their bolt, which appears to copy LMT's extractor design.

    Sent from my SPH-D710 using Tapatalk 2
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  10. #50
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    I went to someones abode the other night to look at his bolt. My suspicions appear to be confirmed that the LMT enhanced bolt extractor springs appear to be ejector/selector springs that were cut into a 1/3.

    Quote Originally Posted by Heavy Metal View Post
    I can telly you one thing, they waaaay outlast the standard extractor springs.

    I bought a sackful at a buck per spring and have never needed one. The biggest danger would be losing one.



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