G&R Tactical
Results 1 to 10 of 10

Thread: Cycling Issue

  1. #1
    Join Date
    Dec 2018
    Posts
    8
    Feedback Score
    0

    Cycling Issue

    Hello
    I had dropped off all the parts for a AR build with a local 'smith in August. Most of his reviews were positive but I'm thinking I might have given him something that's not in his expertise. After several attempts to get some info out of him this is what I got ......

    "I thought the gas tube was too long so I ordered a new one. That is not the case.
    The gas block has been fitted to the shoulder of the barrel, at its correct point. When the bolt is dropped down, it will not seat fully into battery, making me think there is something to do with the gas tube/bolt. When the bolt does seat completely into battery, it forces the gas tube ever so slightly forward that it turns the rifle into a single shot. Now, I am trying to figure out what the actual issue is. Is it the gas key, gas tube, or bolt itself. "

    The barrel did not come with a gas port. Could he have drilled the port too small?

    Any suggestions much appreciated.

  2. #2
    Join Date
    Apr 2014
    Location
    Colorado
    Posts
    360
    Feedback Score
    6 (100%)
    My guess is the gas block is not supposed to be on the barrel shoulder. If that's the case it could push your gas tube into the receiver too far and he may have drilled your gas port in the wrong spot.

    ETA: What barrel and gas block are you using?
    Last edited by dmd08; 11-30-19 at 11:12.

  3. #3
    Join Date
    Dec 2018
    Posts
    8
    Feedback Score
    0
    Quote Originally Posted by dmd08 View Post
    My guess is the gas block is not supposed to be on the barrel shoulder. If that's the case it could push your gas tube into the receiver too far and he may have drilled your gas port in the wrong spot.

    ETA: What barrel and gas block are you using?
    The barrel is a 16" 6.8 SPC:

    https://columbiariverarms.com/produc...-configurable/


    The gas block is:

    https://www.brownells.com/rifle-part...prod80559.aspx

    Before I gave him all the parts I dry fit it all together and it the only issue I saw was that the gas tube was too long based on the tick mark on the side of the receiver. I marked it and showed it to him when I dropped it all off.
    Last edited by a376z; 11-30-19 at 13:49.

  4. #4
    Join Date
    Apr 2014
    Location
    Colorado
    Posts
    360
    Feedback Score
    6 (100%)
    That gas block is kind of unique for a regular AR build and I don't know anything about it. I don't know what to tell you. Are you sure it's compatible with what you're trying to build?

  5. #5
    Join Date
    Nov 2010
    Location
    MI
    Posts
    2,741
    Feedback Score
    20 (100%)
    Link doesn't work.

    Is that a 308 barrel?

    The gas tube is for the Colt LE901, which is likely a little different that standard mid length.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT OPTIMUM-S Barrel - 11.5" SB Suppressor, 11.5" SBT 25 Deg Tapered Shoulder Suppressor
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  6. #6
    Join Date
    Dec 2018
    Posts
    8
    Feedback Score
    0
    Quote Originally Posted by Clint View Post
    Link doesn't work.

    Is that a 308 barrel?

    The gas tube is for the Colt LE901, which is likely a little different that standard mid length.
    It's a 6.8 barrel

    Try this

    https://columbiariverarms.com/produc...-configurable/
    Last edited by a376z; 11-30-19 at 13:49.

  7. #7
    Join Date
    Dec 2018
    Posts
    8
    Feedback Score
    0
    As far as I know the only unique thing about it is the sight is mated to it. Other than that it's just a GB. It's the same FSB on the Colt 901's and 6940's.

    The only thing I can think of causing issues would be the inside diameter of the gas tube but I don't think they are different, are they? The proper gassing is dependent on tube length and port size, no?

  8. #8
    Join Date
    Aug 2019
    Posts
    69
    Feedback Score
    1 (100%)
    deleted
    Last edited by the AR-15 Junkie; 12-05-19 at 13:24.

  9. #9
    Join Date
    Jul 2006
    Location
    Oregon
    Posts
    3,148
    Feedback Score
    2 (100%)
    It's going to be the proprietary 308 gas block and tube, not the thickness of a handguard cap.

    What led you to believe that would work on an AR15?

  10. #10
    Join Date
    Dec 2009
    Location
    Utah
    Posts
    8,104
    Feedback Score
    3 (100%)
    Wrong forum. Please read posting rules for this one.
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

Bookmarks

Posting Permissions

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