AAC 300 BLK Upper

Discussion in 'The Black Rifle' started by MechTech, Oct 30, 2012.

  1. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
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    Has anyone built a 300 BLK upper for their AR yet? I was thinking about building one, but the barrel assy. alone are $425.00+. I can get a 9" barrel AAC 300 BLK upper for around $900.00 complete and it comes with the Blackout flash hider.
    [IMG]
  2. sharky47 Active Member

    Member Since:
    Nov 1, 2012
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    You can get a great bbl for waaaaaay less than that. Buddy at work just built an SBR with a Wilson Combat stainless 11.5", $250 online and that is kind of an expensive one.

    I have a reamer on the way, can always make one for you.

    Just made a lightweight carbine bbl for my AR10 build, AR bbls are fun to make.


    If you want any info on ARs in BLK, ask away, built a bunch of them!
  3. MechTech Moderator/ Damn Yankee

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    Are there any function reliability issues with 7.5" to 9" barrels? I want a PSD with some balls to it! I am running a gas piston 12.5" 5.56 upper right now. I originally went gas piston to ensure reliability with a 10.3" shorty upper, but switched to a 12.5" DD barrel.
  4. dcompton New Member

    Member Since:
    Jun 21, 2012
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    My barrel was $199. I bought two. one in 16" and one in 8.5" Both run superb.

    DC
  5. sharky47 Active Member

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    Nov 1, 2012
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    Just cut down a Noveske 16" to 8.5", took a large gas port, but cycles subs and supers without a can.
  6. bombadillo Moderator

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    Mar 19, 2012
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    What length do you prefer?

    http://www.surplusammo.com/advanced...r-receiver-assembly-kac-urx-ii-free-shipping/
    This is a nice upper with a KAC free-float rail for $979. Brake and all the goodies for the barrel price alone you were quoting

    http://www.surplusammo.com/advanced...-receiver-assembly-kac-urx-iii-free-shipping/
    9" AAC upper (made by the original is always nice, kinda like buying colt) and its an SBR for $979

    And more around, so keep checking. $900 for a barrel is friggin ridiculous unless its a 24" Match Krieger or something.
  7. sharky47 Active Member

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    Nov 1, 2012
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    Somewhere between 9-12" seems to be well suited for both the performance of the cartridge and gas system.

    16" is an arbitrary number that has no basis in science or reality. My first build was an M1 Sales 16", built a 12" upper for my friend at the same time with an identical donor barrel. My upper chrono'd slower than his with the same ammo. This was with subs of course, the bullet was coasting to a stop in the longer barrel!

    What I am getting at is because of the severe market distortion that has resulted due to firearm laws, we simply do not know or care about the best barrel lengths of many cartridges.
  8. bombadillo Moderator

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    I can't get an SBR here so its just dreaming for me...
  9. USMC6174 Member

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    Jul 24, 2012
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    I know this is an old thread, but I just picked up a Radical Firearms 300blk 16" socom upper. Awesome price too. $301 shipped to my door step. I put it on my Ruger ar556 lower and shot a few groups yesterday with some various hand loads. I couldn't shoot better than a 1.5" group but the stock Ruger trigger is horrible and my hand loads were developed for my Ruger American Ranch 300blk. I will be buying many more products from Radical Firearms. I started out looking to build an upper but after pricing everything out and seeing this upper for $301, it wasn't worth it.
  10. USMC6174 Member

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  11. USMC6174 Member

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  12. Joenavy85 Member

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    Mar 15, 2014
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    Reviving the thread again, lol. I came across Radical Firearms the other day and was very intrigued by what they were offering for the prices they had. Now that I have read a review from a place I can trust I'm even more intrigued. I'm considering getting one of their 8.5" 300BLK uppers once I get my SBR paperwork done (doing the trust papers at the moment since I'm deployed, finalizing once I get back) and adding on an AAC 7.62 SDN-6 or a Yankee Hill LT Phantom.
  13. USMC6174 Member

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    Jul 24, 2012
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    You won't be dissapointed Joe, I have since build a separate dedicated lower for that radical upper and built an additional 10.5" upper on a pistol for my 762 sdn 6. If I were to do it all over again I would buy the omega from silencerco. The sdn 6 is sweet but it's a little outdated tech. And now that they're owned by Remington......well I'm sure you're familiar with how the freedom group mangled marlin.

    Sent from my SCH-I545 using Tapatalk
  14. wood chucker Moderator

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    The good new there is Remington has replaced all the tooling and all the machinery since the move and nowadays the quality of 336's I find on the rack is Marlin circa 1967 in mechanical fit and function inside and Marlin 1985 in fit and finish outside.

    My buddy has a 1967 336 with seven rounds down the pipe and the other 13 still in the box that came with it and he has a 1985 made 336 he uses on occasion.
  15. wood chucker Moderator

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    Dec 19, 2012
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    Yah I wouldn't mind me a 18 inch .300 BLK upper but I'd have to get me an ARES SCR lower to put it on. And some wood furniture too, just because.
  16. USMC6174 Member

    Member Since:
    Jul 24, 2012
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    I bought an off the shelf 1894 in 44 mag and the tooling and machine work was great but it wouldn't shoot anything decent enough for me, bought a 1974 year model 1894 and it shoots circles around it. Eventually marlin will be OK, but I'm nervous I own an nfa item that might one day need servicing from the freedom group.....

    Sent from my SCH-I545 using Tapatalk
  17. Joenavy85 Member

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    I have the same view at this point. I have a Marlin XT-22TR that has had absolutely no issues thankfully. I have plenty of time to decide on which suppressor I want. I have a buddy that has a Huntertown Arms Kestrel 308, once I getthe Tromix barrel on my MVP I'll go to the range with him and try it out to see how the balance is.
  18. wood chucker Moderator

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    Whats the thing on the bottom of the barrel ?
  19. USMC6174 Member

    Member Since:
    Jul 24, 2012
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    That's a flash light mounted on the other side, it's gone now....sold that ruger and just built a few lowers instead.

    Sent from my SCH-I545 using Tapatalk
  20. jwb47 Active Member

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    May 4, 2014
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    I have a few blackouts .

    [IMG]

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