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Thread: Do AR manufacturers "do" the mid-length differently?

  1. #11
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    Quote Originally Posted by Eric D. View Post
    There is no established standard for mid length gas ports so yes, every manufacturer does things a little differently. It's been said that BCM has done cyclic rate testing to determine their gas port size.
    This.


    C4

  2. #12
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    Quote Originally Posted by lifebreath View Post
    I've got 5 mid-length guns: 3 KAC SR-15 (two 16" and a 14.5"), a BCM 14.5" and a Noveske 16". I've never had a gas issue with any of them, but I shoot only XM193, M855 or Hornady match .223. The SR-15 gas system is more like the Noveske "intermediate" system, in that it is longer than the mid-length of BCM, Noveske or DD, but shorter than rifle-length.

    I run the Noveske with an A2 stock/buffer and the BCM with an H buffer. Interestingly, the 16" SR15 comes from the factory with a carbine buffer, but the 14.5" SR15 comes with an H2 buffer.
    Both the extant intermediate gas systems (KAC, and the Noveske/MSTN spec) have been revised at some point in time, my guess is that from the manufacturer side it's a bigger concern that it run on anything than whatever gains can be made to reduce recoil impulse when running exclusively 5.56 pressure ammo.

    I recall seeing that DD was on the relatively open end for gas ports, but any broken in gun being fed decent ammunition will run without issues unless you're trying to run a 7oz buffer or something silly.
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
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  3. #13
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    I am at about 750 rounds of wolf through my DD m4v7 . after 500 rnds with no lube it started to get sluggish, I then put some lube on the bolt and it continued to run like a champ. It does not seem undergassed to me. I will say this though, it feels like one of the smoothest shooting ars I have shot.

  4. #14
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    Had a Noveske N4 Middy once. Ran overgassed right out of the box and the more "broken in" it got the move overgassed it ran. Not excessivly though, as in the ejecting brass wasn't hitting the handguard, which is a sign of severe over gassing.

    Ran an H2 buffer in it and it didn't help much. Putting a Vltor A5 with a Wolff extra power spring brought it down to"normal" function.
    It is missing the point to think that the martial art is solely in cutting a man down; it is in killing evil. It is in the strategem of killing the evil of one man and giving life to ten thousand -Yagyu Munemori

  5. #15
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    Quote Originally Posted by GrumpyM4 View Post
    Had a Noveske N4 Middy once. Ran overgassed right out of the box and the more "broken in" it got the move overgassed it ran. Not excessivly though, as in the ejecting brass wasn't hitting the handguard, which is a sign of severe over gassing.

    Ran an H2 buffer in it and it didn't help much. Putting a Vltor A5 with a Wolff extra power spring brought it down to"normal" function.
    How did you determine it was over gassed? Was it malfunctioning?

    Sent from my DROID RAZR using Tapatalk 2

  6. #16
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    Quote Originally Posted by mtdawg169 View Post
    How did you determine it was over gassed? Was it malfunctioning?

    Sent from my DROID RAZR using Tapatalk 2


    If it had malfunctioned, I would have said so. I didn't, so it wasn't.

    How about you "school" me on how to identify an overgassed gun.
    It is missing the point to think that the martial art is solely in cutting a man down; it is in killing evil. It is in the strategem of killing the evil of one man and giving life to ten thousand -Yagyu Munemori

  7. #17
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    Quote Originally Posted by mtdawg169 View Post
    How did you determine it was over gassed? Was it malfunctioning?

    Sent from my DROID RAZR using Tapatalk 2
    Don't forget everyone is an expert here. There are only a few members on the board who can truly diagnose an ovegassed gun. Im not saying Im one of them, neither is grumpy if he was he would have stated the process used to diagnose his problem. People who know how do not have to get defensive when called out. They simply state the process. They do not ask for schooling on the subject, but Im sure his handy ejection chart helped him with his diagnosis.

    If your going to go with a mid length bcm does it the best. All i own are middies and one noveske intermediate, and the bcm is head and shoulders ahead in the middies.

  8. #18
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    I have shot around 200 rounds of soft point 64 grain (.223) out of my SR15 as well as M855, XM193 and MK318. Only difference I noticed was that the soft points were softer shooting with this system. I do feel that it shoots a bit smoother/softer with 5.56 pressure ammo than my buddies Noveske.
    ETC (SW/AW), USN (1998-2008)
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  9. #19
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    Double post...
    Last edited by hotrodder636; 09-30-12 at 07:50.
    ETC (SW/AW), USN (1998-2008)
    CVN-65, USS Enterprise

  10. #20
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    Quote Originally Posted by GrumpyM4 View Post
    If it had malfunctioned, I would have said so. I didn't, so it wasn't.

    How about you "school" me on how to identify an overgassed gun.
    Well, I guess you're true to your screen name, Mr. Grumpy. I'm not trying to take anyone to school here, I just asked a simple question. Let me try again, why did you think your Noveske was over gassed? Typically overgassed guns DO malfunction, hence my earlier question. Since yours didn't, now I'm really curious how you determined or why you felt it was over gassed.


    Edit: maybe I should have posed this question another way. What is your definition of "normal" function? Since you had zero malfunctions, but still deemed your N4 to be overgassed, I assume you're using some other method to quantify what you refer to as "normal" function.
    Last edited by mtdawg169; 09-30-12 at 12:15.

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