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Thread: A5 EMOD system on a STD carbine

  1. #11
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    *edit* uwe1 already posted the same info.
    Last edited by Mr blasty; 11-19-11 at 02:06.

  2. #12
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    http://www.youtube.com/watch?v=njaLucvpEV0

    But, I suppose you gain a few ounces from the larger buffer, longer SE.

    Overall, compared to a stock CTR setup , the VLTOR EMod A5 would be about 7-8 oz to weapon weight?

    And the same effect cannot be obtained with just a heavier buffer - the added length and spring really make the difference?

    Thanks.
    Last edited by m4brian; 11-19-11 at 08:42.

  3. #13
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    Quote Originally Posted by uwe1 View Post
    The A5 has a longer than carbine receiver extension

    You can put any stock on it you want.

    Sorry for the dumb question, but I want to make sure I'm understanding this correctly...

    So I can put a "normal" M4 collapsible stock on the longer A5 receiver extension, but then it won't collapse all the way (so that the front of the stock is flush with the back of the lower receiver).

    Right?

  4. #14
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    Quote Originally Posted by Bimmer View Post
    Sorry for the dumb question, but I want to make sure I'm understanding this correctly...

    So I can put a "normal" M4 collapsible stock on the longer A5 receiver extension, but then it won't collapse all the way (so that the front of the stock is flush with the back of the lower receiver).

    Right?
    Any stock will go onto the A5 extension.

    I believe only the Vltor Emod and the Magpul ACS will collapse down all the way, for the stocks with rubber pads.

    The normal M4 stock has a hole in the back where the receiver extension sits so it will collapse all the way, but a small part of the receiver extension will stick out.

  5. #15
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    Quote Originally Posted by uwe1 View Post
    The normal M4 stock has a hole in the back where the receiver extension sits so it will collapse all the way, but a small part of the receiver extension will stick out.
    How much?

    Sorry to be particular, but if it's only 1/8" or so, then my comfy and tacky rubber butt pad will still fit. If it's 1/2" or more, then that's a problem...

    I'd check myself, but I'm overseas for another six weeks and my rifle is 8,000 miles away.

  6. #16
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    Quote Originally Posted by m4brian View Post
    http://www.youtube.com/watch?v=njaLucvpEV0

    But, I suppose you gain a few ounces from the larger buffer, longer SE.

    Overall, compared to a stock CTR setup , the VLTOR EMod A5 would be about 7-8 oz to weapon weight?

    And the same effect cannot be obtained with just a heavier buffer - the added length and spring really make the difference?

    Thanks.
    You can probably achieve a very similar recoil characteristic using an H2 buffer and either a Brownells CS action spring or Springco blue. I haven't tried Springco blue springs so I really can't comment from personal experience. The A5 is smooth. From my extensive reading on the topic, what I've gathered is that the rifle length spring, is longer, therefore has more coils, and the spring tension is more consistent under compression when there are more coils. This explains why the A5 affects the recoil the way it does. Smooth.

    One of the main reasons for adding more weight and tension in the buffer system, is to further delay the unlocking of the bolt so that the chamber pressure will decrease. This allows for more reliable extraction, and the carrier moves at a more consistent velocity without bouncning off the back end of the receiver extension. The downside of course is that if you have too much weight, the system behaves more sluggishly, you get short-stroking and failure to lock back on empty mags with weaker ammo, and less reliability if the system gets too dirty/less lubricated.

    The reason I don't like Emods is because they are much heavier compared to the other stocks and I choose not to use them. You can still use the A5 system with another stock. For the time being, I've been using an MOE and it's been perfectly fine.

    I really don't recommend you dicking around with the gun unless you are really sure what you are doing because you will end up with a much less reliable gun. Before I started experimenting with anything, I google searched the A5 (and Springco blue springs) and read everything I could. The A5 system, if you install it as is, should be good to go. Don't mess around with the buffer weights and springs unless you know what you are doing.

    I read this thread, TWICE:
    https://www.m4carbine.net/showthread.php?t=56043

    If you already have a standard receiver extension and don't feel like disassembling everything, I would get a H buffer, H2 buffer, and a CS spring/Springco blue, and take all of this out to the range with different types of ammo and TEST it out. I couldn't stand the powdered tungsten buffer that came with my DDM4.
    Last edited by uwe1; 11-19-11 at 10:20.

  7. #17
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    More explanation of the system:

    https://www.m4carbine.net/showthread.php?t=88723&page=3

    BUT... two questions:

    1. If I HAVE to mortar a round, would it be better to have the Emod or ACS (with added weight) to prevent busting the stock? I am trying to watch weight also, Emod vs. Imod vs. CTR...

    2. I have another gun, (DD M4) which has had a few hiccups with 20 round mags. I do believe that the greater bolt velocity/acceleration could present the BCG in a way that leads to nose-ups occasionally - maybe the A5 system could help. [20 round mags have a short leg, unlike the magpul 30s. My theory is that with greater bolt acceleration, this can work to make the 20s cause a 'nose up' when 2-3 rounds are left].

  8. #18
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    Seek (orange "Search" button near the top of the page) and ye shall find:

    https://www.m4carbine.net/showthread.php?t=56043

  9. #19
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    Quote Originally Posted by Bimmer View Post
    How much?

    Sorry to be particular, but if it's only 1/8" or so, then my comfy and tacky rubber butt pad will still fit. If it's 1/2" or more, then that's a problem...

    I'd check myself, but I'm overseas for another six weeks and my rifle is 8,000 miles away.
    It's more than an half inch. I can't collapse my Imod all the way flush. The number 2 position on the A5 receiver extension is the shortest it will go and still lock.
    Last edited by SteadyUp; 11-19-11 at 10:31.
    All tyranny needs to gain a foothold is for people of good conscience to remain silent.

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  10. #20
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    Quote Originally Posted by Bimmer View Post
    How much?

    Sorry to be particular, but if it's only 1/8" or so, then my comfy and tacky rubber butt pad will still fit. If it's 1/2" or more, then that's a problem...

    I'd check myself, but I'm overseas for another six weeks and my rifle is 8,000 miles away.
    Just pulled out the gun from the safe and checked....

    On my gun, once again sample of one...

    Vltor A5 receiver extension, S&W marked M4 buttstock, collapsed down as far as it will go, will have the bottom end of the RE protruding out roughly 1/2" or slightly less and the top end about 1/8". The M4 stock is angled. On mine, there is still a slight gap between the castle nut and where the stock begins.
    Last edited by uwe1; 11-19-11 at 10:26.

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