Anyone have an RRA 10.5" upper?

Discussion in 'GSSF' started by emt1581, Feb 8, 2010.

  1. emt1581

    emt1581 Curious Member

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    I got an email saying that a company got 10.5" RRA (.223) uppers in stock. Now I've wanted to either build an AR pistol or buy a Draco/AK pistol for a while now. They want around $485 for the RRA upper while the Draco would only be $375 OTD.

    Now I've got a bunch of AR's. Don't have any AR pistols or SBR AR's. I've read that the pistol uppers can have issues with cycling if the bcg or buffer tube is too short.

    So does anyone have one? Is the RRA upper good to go or does it have it's issues?

    Thanks!:)

    -Emt1581
     
  2. emt1581

    emt1581 Curious Member

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    Anyone?

    Again, I'm just looking for information as far as quality, reliability, etc. on this upper.

    Thanks!:)

    -Emt1581
     

  3. emt1581

    emt1581 Curious Member

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  4. NeverMore1701

    NeverMore1701 Fear no Evil Platinum Member

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    If I were to get a shorty (and I am, later this year), I'd go with BCM 11.5". LMT also makes a very nice 10.5". Noveske is a very solid option too, but more expensive.
     
  5. emt1581

    emt1581 Curious Member

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    If I may ask...why are you going with the one inch longer barrel? Is the fps/velocity much different?

    Noveske is definitely up there in price.

    Thanks!

    -Emt1581
     
  6. NeverMore1701

    NeverMore1701 Fear no Evil Platinum Member

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    Because BCM doesn't make a 10.5".
     
  7. harleyfx69

    harleyfx69

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    you wont regret going for the top shelf uppers emt ..
     
  8. emt1581

    emt1581 Curious Member

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    What do you mean by top shelf? I mean what companies/brands do you mean?

    Thanks!:)

    -Emt1581
     
  9. OUSooner

    OUSooner

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    I have a 10.5" Rock River upper. Would not trade it for anything.


    [​IMG]

    [​IMG]

    [​IMG]
     
  10. MaximaDrvr

    MaximaDrvr

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    The upper really isn't going to cause problems. You can do an extractor upgrade if you have problems.
    Most people just have to play with buffers to get the correct weight for the best cycling.
     
  11. harleyfx69

    harleyfx69

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    noveske, daniel defense, lmt, colt, larue, and a few others that i dont remember off the top of my head,
     
  12. KalashniKEV

    KalashniKEV

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    Apparently it's been discovered that the 1 extra inch makes all the difference in the world AFA reliability. Pressure dumps when the bullet exits the muzzle and the bore was too close to the port on 10.5s. It keeps the gas acting on the carrier that much longer to ensure reliable operation.

    Nobody with a choice to make whips 10.5" these days... they all go 11.5"

    It also helps keep your muzzle velocity up that much longer, and w/ 5.56 that's important b/c speed kills, reliable fragmentation, blah blah, you know the rest.

    [​IMG]

    Basically BCM. It's nothing to freak out about if you already have an RRA or a Bushie that's reliable and accurate, but "The Chart" is a good reference to compare manufacturers and prices. It's also the source of all kinds of foolish snobbery.

    Google it and take the M4Carbine.net link... (are other forum links OK here?)
     
  13. MaximaDrvr

    MaximaDrvr

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    you can link it here. No worries.
     
  14. emt1581

    emt1581 Curious Member

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    So the 11.5" makes a HUGE difference....where does it end? Does a 12.5" make an even more significant difference?

    While we're talking about lengths...how do the 7" Kitty Kats and other uppers compare in power/distance capability (all things being equal) to the 11.5" uppers?

    Thanks!

    -Emt1581
     
  15. MaximaDrvr

    MaximaDrvr

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    It is around 100fps per inch IIRC. A 7.5'' is barely braking 2000fps IIRC.
    There is a chart floating around here somewhere of barrel lengths and velocity.
    A 10.5'' is the minimum recommended for reliable fragmentation.
     
  16. emt1581

    emt1581 Curious Member

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    By that logic then, wouldn't the shorter barrel yield better penetration?

    I know we're looking for the bullet to fragment to spread out and stop the threat....but again...just talking about penetration...

    Thanks!

    -Emt1581
     
  17. MaximaDrvr

    MaximaDrvr

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    I just did a quick google search, and it looks like the penetration also decreases under 2000fps.
    Maybe someone more knowledgeable will chime in, as I can't find the chart and don't know enough to venture farther.
     
  18. KalashniKEV

    KalashniKEV

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    I would imagine if an M4 had a barrel chopped that close to the port it would suffer from the same intermittent reliability issues, due to the fact that it dumps the gas before it has a chance to reliably act upon the key.

    7-7.5" barrels produce nearly as much "shock and awe" for the shooter as target, and are really more about "Big Pimpin" than anything else. Seldom will you ever see one in a professional application.