Close
Page 1 of 3 123 LastLast
Results 1 to 10 of 25
  1. #1
    Machine Gunner Martinjmpr's Avatar
    Join Date
    May 2014
    Location
    Pueblo
    Posts
    2,107

    Default 9mm, some very basic questions (not covered in the other 9mm thread...)

    I did read through the other thread, just wanted to make that clear. My situation is this: I want to build another AR but I already have one in 5.56, am interested in another caliber. Had thought about 7.62 x 39 because ammo is cheap, but all the stuff I read about problematic magazines made me shy away from that - I don't want to spend several hundred bucks on something that doesn't work. So now I'm thinking 9mm since I have a couple of Glocks (17 and 23 w/9mm conversion barrel.) So my questions are on the 9mm AR platform itself. First of all, does the 9mm AR use the direct gas impingement of the 5.56 version or is it straight blowback? Reason I ask is that I know other 9mm carbines are straight blowback with an unlocked bolt. Also on the other 9mm thread I was looking at pictures of the bolt and it doesn't look like that bolt rotates, but maybe I'm not looking at it right? Next question, other than a 9mm upper, what else is needed? I know there's a magazine block to take the smaller mag but is there a separate magazine release or does it use the same one as the 5.56 version? Final question, are there any "CO Legal" < 15 rd magazines that will work in these? Thanks in advance.

  2. #2
    I am my own action figure
    Join Date
    Jan 2010
    Location
    Wheat Ridge
    Posts
    4,010
    Blog Entries
    1

    Default

    After I did all my research about 9mm uppers, I ended up with a .22LR upper AND a .300 BO upper. Just a thought.
    Good Shooting, MarkCO

    www.CarbonArms.us
    www.crci.org

  3. #3
    The "Godfather" of COAR Great-Kazoo's Avatar
    Join Date
    Sep 2003
    Location
    Washboard Alley, AZ.
    Posts
    48,073

    Default

    Quote Originally Posted by Martinjmpr View Post
    I did read through the other thread, just wanted to make that clear. My situation is this: I want to build another AR but I already have one in 5.56, am interested in another caliber. Had thought about 7.62 x 39 because ammo is cheap, but all the stuff I read about problematic magazines made me shy away from that - I don't want to spend several hundred bucks on something that doesn't work. So now I'm thinking 9mm since I have a couple of Glocks (17 and 23 w/9mm conversion barrel.) So my questions are on the 9mm AR platform itself. First of all, does the 9mm AR use the direct gas impingement of the 5.56 version or is it straight blowback? Reason I ask is that I know other 9mm carbines are straight blowback with an unlocked bolt. Also on the other 9mm thread I was looking at pictures of the bolt and it doesn't look like that bolt rotates, but maybe I'm not looking at it right? Next question, other than a 9mm upper, what else is needed? I know there's a magazine block to take the smaller mag but is there a separate magazine release or does it use the same one as the 5.56 version? Final question, are there any "CO Legal" < 15 rd magazines that will work in these? Thanks in advance.
    NO on 15 rd 9mm AR mags. There's a smith in CT who does, or was doing mag, well adaptions to allow use of G mags. I went the sten mag / olympic upper way. At the time sten mags were $5 per.
    The Great Kazoo's Feedback

    "when you're happy you enjoy the melody but, when you're broken you understand the lyrics".

  4. #4
    Machine Gunner SAnd's Avatar
    Join Date
    Jul 2009
    Location
    Denver
    Posts
    1,624

    Default

    Lone Wolf R&D manufacturers AR lowers that use Glock magazines. Double Diamond shows them on their webb site but has them as "unavailable" I believe the Lone Wolf lower uses the Colt style 9mm upper. I don't believe that anyone is making a gas operated upper, they are all blowback.

    http://www.lonewolfdist.com/Detail.a...285845&CAT=288

    Olympic Arms is also listing a complete Glock mag carbine on theirs site-
    http://www.olyarms.com/shop/rifles/a...els/k9-gl.html

    It looks like both of the above will take 15 round Glock mags.
    Last edited by SAnd; 06-16-2014 at 15:30.
    Making good people helpless won't make bad people harmless.

  5. #5
    BIG PaPa ray1970's Avatar
    Join Date
    Feb 2010
    Location
    Thornton
    Posts
    18,799
    Blog Entries
    1

    Default

    Some day I plan to build a 9mm. I like the Double Diamond lowers.

  6. #6
    Machine Gunner Lurch's Avatar
    Join Date
    Nov 2011
    Location
    Elizabeth
    Posts
    1,224

    Default

    Straight blowback and doesn't rotate. Another option is a magwell and converted UZI mags.

  7. #7
    If I had a son he would look like....Ben SideShow Bob's Avatar
    Join Date
    Mar 2010
    Location
    SE Aurora
    Posts
    7,120

    Default

    If you wanted to go with a larger caliber, Bazooka Bros. makes pistol caliber Gas impingement ARs in the following calibers.

    45 ACP, 45 Super, 460 Rowlands, 10 mm, 7.62x25 and 45win. Mag.
    And they sell complete upper, complete lowers or stripped lowers for the same calibers.

    http://bazookabrothers.com/pages/home/1
    Last edited by SideShow Bob; 06-16-2014 at 18:25.
    My T.P. wheeling and dealing feedback is here.

    Opinions are like assholes, everybody has one, and it stinks more than mine.


    Yo Homie, That my chainsaw ?



    Pati, improbe et vince

  8. #8
    Don of the Asian Mafia ChunkyMonkey's Avatar
    Join Date
    Mar 2009
    Location
    Centennial, CO
    Posts
    8,397
    Blog Entries
    1

    Default

    GMR
    http://www.jprifles.com/1.2.13_GMR.php

    Or the low end one is JR 9mm carbine
    Quote Originally Posted by crays View Post
    It doesn't matter how many rifles you buy...they're still cheaper than one wife, in the long run.
    Coarf Feedback
    Instagram

  9. #9
    Machine Gunner Circuits's Avatar
    Join Date
    Sep 2003
    Location
    Colofornia Springs, CO
    Posts
    2,411

    Default

    The most common 9mm upper systems, Colt pattern or Olympic pattern, are blowback, with no gas system at all.

    There are direct impingement 9mm uppers, but they can be a bit ammo picky and problematic, given how little gas the 9mm cartridge generates. The 45 and 40 DI versions are much more reliable and less ammo-dependent.

    No matter the upper you choose, in order to use Glock mags, you'll need a mag block or a dedicated Glock mag lower. The mag blocks are no longer made or generally commercially available so far as I know, so getting one involves finding one used or commissioning custom work.
    "The only real difference between the men and the boys, is the number and size, and cost of their toys."
    NRA Life, GOA Life, SAF Life, CSSA Life, NRA Certified Instructor Circuits' Feedback

  10. #10
    Kitty Molester ThunderSquirrel's Avatar
    Join Date
    Apr 2010
    Location
    Aurora/Centennial
    Posts
    486

    Default

    I have a Double Diamond Lower that takes Colt Mags, paired with a Rock River 9mm Upper. I went with the dedicated 9 upper only because it does not have the hole drilled for the gas tube. Its not a huge deal, but keeps the blowback from throwing out into the handguard / barrel. Just a preference thing.

    As stated above, using Glock mags is going to require a dedicated glock lower. Double Diamond makes a great one, But I think their lead times are crazy now. Also, glock mags will also require you to 'fit' your bolt to the mags. The feed lips on a glock mag are higher than they are on a colt mag, and require you to take some material off your bolt to avoid excessive wear.

    If you're interested in taking a look at one and ideas, I can meet you up at Bowers sometime, since it says you are located in Englewood.

    Obligatory gun porn below...
    Only Hits Count, You Can't Miss Fast Enough To Catch Up.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •