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Thread: Jim Sullivan / Armwest, LLC M-4 Improvement Program

  1. #31
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    I went through the patent, but most of this stuff isn't new at all. It is good to see a lot of the ideas put together into a single package though.

  2. #32
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    Quote Originally Posted by justin_247 View Post
    Good stuff. Thanks for posting this.

    Of note, there's a lot more in that patent application than the modified carrier.

    - uses a gas tube that has a "radiator" portion (appears to just be thicker for about half the length and threaded)
    - a self-regulating gas block of some sort - uses a metering plug
    - new gas rings that have a bulge in them to ensure a tighter seal
    - larger lugs on the bolt assembly
    - a longer carrier key
    - a different bolt cam design that allows the carrier to move back 1/3" more
    - longer barrel extension allowing for larger lugs
    - wider feed ramps on the extension
    - the gas port on the barrel is about 3/4" farther down the barrel
    - a shorter buffer assembly

    There is a lot more stuff in there...
    Sounds like a KAC SR15 had a one night stand with an LMT enhanced carrier.

    In all seriousness, it's very interesting. Delaying unlocking, slowing the overall operating cycle, reducing gas system pressure, etc are all things that have proven to extend parts life and to help guns be more controllable.
    Last edited by BufordTJustice; 11-30-14 at 09:43.
    "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."

  3. #33
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    Quote Originally Posted by tom12.7 View Post
    I went through the patent, but most of this stuff isn't new at all. It is good to see a lot of the ideas put together into a single package though.
    This is a critique I have seen before. I think it's important to point out that while this is almost always the case with any mechanical device, very rarely do companies take a few extra steps to integrate as many of those past features into a single system. But when they do so, the results can be almost revolutionary...

    As an example, there was practically nothing new in the iPhone when it came out, but it was the first device to integrate all of those features into a single package. And look how it turned out.

  4. #34
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    In the video the full auto firing cadence didn't seem very consistent.

  5. #35
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    Doesn't the M27 fire from the open bolt in FA as well?

  6. #36
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    Quote Originally Posted by caelumatra View Post
    Doesn't the M27 fire from the open bolt in FA as well?
    I think you are confusing the M27 IAR with the LWRC IAR candidate. M27 IAR is closed bolt only.

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