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Which 9mm SBR AR Upper?

Discussion in 'NFA Firearms and Accessories' started by crimsoncomet, Mar 20, 2012.

  1. crimsoncomet

    crimsoncomet Well-Known Member

    I am debating which brand 9mm SBR upper to buy, and what barrel length. I definatley want three lug capability. So I will either be buying a barrel from TROS USA or their thread to three lug adapter. I want usability and want it to be quiet with a suppressor. I dont want to end up with a 20" rifle with suppresor attached. I also want a longer handguard. I would like the handguard to come close to the end of the barrel and just the three lug to stick out. I put a call into RRA and ask if they could install there CAR handguard on there 7" upper. They said they would not do to safety reasons. I told her that i would be putting a can on it, and it would be no big deal. Still recieved a no. I just wanted to get some recomendations.

    8.5" CMMG upper w/ ramped bolt (TROS adapter) It would most likely end up being about 17" with suppressor
    dedicated RRA 7" upper- switch out short hand guard to CAR length (TROS adapter)
    Custom TROS 7" barrel and build my own? (dont know if they would even do it)
    JT 7.5" dedicated upper with CAR length handguard (TROS adapter)
  2. dprice3844444

    dprice3844444 member

  3. rjrivero

    rjrivero Well-Known Member

    Why would you need a gas vent for a 9mm?
  4. Wahoo95

    Wahoo95 Well-Known Member

    If you are concerned about OAL, go with a 5" TROS 3 lug barrel, ramped bolt, and a heavy buffer like the Slash 9Q with Wolff Xtra power spring to really make it quiet and get rid of any gas blowback issues.

    Mine was built on a RRA upper and ran like a sewing machine!



    Sent from my DROIDX using Tapatalk
  5. Chopdoktor

    Chopdoktor Well-Known Member

    CMMG 7.3", runs like a boss. I have had zero malfunctions in over 500 rounds. On top of that, I had a wonderful experience with their customer service (needed a spare firing pin).
  6. dprice3844444

    dprice3844444 member

    rj,for gases that might back up into the upper receiver and back in your face via the charging handle area.

    Quick Overview
    The AR gas vent is a highly effective device for reducing gas blowback affecting shooter's vision and breathing with suppressed AR-15s
    .Product Details
    The AR Gas Vent is a unique product that addresses the problem of gas blow back when firing a suppressed AR-15 rifle. Back pressure caused by suppressor use sends gasses and lubricants back into the user's face, and can prevent effective engagement of targets after just a few rounds being fired. It is difficult to effectively shoot at a target when your eyes are watering shut from hot/irritating propellant gases, or when lubricants are being shot back onto your eye protection.

    The AR Gas vent helps redirect a large amount of gas away from the shooter's face by creating a large channel which vents gas away from the upper receiver. When used in conjunction with a charging handle which has been RTV sealed, gas blow back is VASTLY reduced.

    As a big fan of suppressors on AR-15s myself, I find this product to be invaluable. It does have one minor caveat in that the forward assist's functionality is removed. However, I follow the EAG Tactical/Pat Roger's way of thinking: If a round doesn't want to feed, eject it and feed the next one, and therefore, have never used the forward assist in years of competition and tactical carbine training.

    I've also noticed that the gas vent works great even when firing without a suppressor on!

    Manufacturer's Description:
    The AR Gas Vent is designed to mitigate the pressure in the receivers of an AR15/M16 while shooting suppressed. The ultimate goal of the AR Gas Vent is relieve the pressure in the receivers to help eliminate "gas face", a common problem of hot gas escaping from the area of the charging handle and into the shooters face. The AR Gas Vent allows hot gas to escape out of the port in the AR Gas Vent resulting in a satisfactory shooting experience.

    The AR Gas Vent is machined from 7075 aluminum and coated with a Hardcoat IAW Mil-A-8625, Type 3, Class II finish for durability.

    NOTE: The AR Gas Vent does not provide the function
  7. Wahoo95

    Wahoo95 Well-Known Member

    Heay Buffer and Spring pretty much eliminate the gas issue and port noise making for a quieter rifle. The other added benefit is that the combo also softens recoil.

    GRAPE-DRANK Well-Known Member

    Hey wahoo, what kind of sight is that?
  9. rjrivero

    rjrivero Well-Known Member

    Gotcha. I don't have a Forward Assist on my 9mm. So I guess I can't use one of these. But for .223, it shure is a lot cheaper than a gas buster charging handle!!
    I know I'm not wahoo, but that looks like an Aimpoint Micro.
  10. Wahoo95

    Wahoo95 Well-Known Member

    Aimpoint Micro Red Dot and Midwest Indstries BUIS

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