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Thread: Bolt not locking back

  1. #1
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    Bolt not locking back

    Already asked but I still need some help.

    I understood that the A2 rifle stock and buffer and spring from AR15 would work on AR10 lower receiver.

    I installed and the bolt does not lock back. what am I doing wrong?..
    never push a wrench...

  2. #2
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    The A2 stock and tube work for large frame ARs, but the buffer and spring need to be the shorter AR10 specific versions.

    ETA like these:
    http://www.primaryarms.com/armalite-...-4oz-armea1090

    http://www.primaryarms.com/armalite-...ring-armea1095

    If you manually retract the charging handle, you'll see the BCG won't go back far enough to lock with the current combo of parts.
    Last edited by Clint; 10-09-17 at 15:51.
    Black River Tactical
    BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
    BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
    BRT Bolt Carrier Groups M4A1, M16 CHROME
    BRT Covert Comps 5.56, 6X, 7.62

  3. #3
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    Quote Originally Posted by Clint View Post
    The A2 stock and tube work for large frame ARs, but the buffer and spring need to be the shorter AR10 specific versions.

    ETA like these:
    http://www.primaryarms.com/armalite-...-4oz-armea1090

    http://www.primaryarms.com/armalite-...ring-armea1095

    If you manually retract the charging handle, you'll see the BCG won't go back far enough to lock with the current combo of parts.
    yes you are exactly correct. I manually retracted the charging handle and it did not go back far enough to lock. thank you for the reply and for the links.

    the spring is not in stock. would a standard AR15 carbine spring work?..
    Last edited by ra2bach; 10-09-17 at 16:50.
    never push a wrench...

  4. #4
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    It should technically work without coil bind, but It may feel sluggish on return to battery.
    Check for proper stroke as before, but the higher strength 308 spring is recommended.
    Just search for that Armalite spring part number or it's equivalent to find it in stock somewhere.
    Last edited by Clint; 10-09-17 at 17:12.
    Black River Tactical
    BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
    BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
    BRT Bolt Carrier Groups M4A1, M16 CHROME
    BRT Covert Comps 5.56, 6X, 7.62

  5. #5
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    Quote Originally Posted by Clint View Post
    It should technically work without coil bind, but It may feel sluggish on return to battery.
    Check for proper stroke as before, but the higher strength 308 spring is recommended.
    Just search for that Armalite spring part number or it's equivalent to find it in stock somewhere.
    OK, Armalite, not DPMS? (they vary slightly in length and number of coils). my lower is Palmetto Arms PA10
    never push a wrench...

  6. #6
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    With the Armalite rifle buffer I would get their AR-10 spring. For Armalite the spring is the same for rifle and carbine.

    DPMS uses a shortened buffer in carbine, not sure what they do for rifle.

  7. #7
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    Quote Originally Posted by Todd.K View Post
    With the Armalite rifle buffer I would get their AR-10 spring. For Armalite the spring is the same for rifle and carbine.

    DPMS uses a shortened buffer in carbine, not sure what they do for rifle.
    got it. thanks...
    never push a wrench...

  8. #8
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    I know you are trying to use a rifle stock here but factory PSA lowers use a 1/4" longer receiver extension for their 308AR's and then uses a regular length carbine buffer. This RE is also the same length as the Vltor A5 RE's, if so desired.
    Quote Originally Posted by Sigmund Freud View Post
    A fear of weapons is a sign of retarded sexual and emotional maturity.

  9. #9
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    Quote Originally Posted by Lincoln7 View Post
    I know you are trying to use a rifle stock here but factory PSA lowers use a 1/4" longer receiver extension for their 308AR's and then uses a regular length carbine buffer. This RE is also the same length as the Vltor A5 RE's, if so desired.
    yes, I have A5 with EMOD stocks on a couple guns and the PA10 RE is the same size. the PA10 buffer is shorter than a carbine buffer though...
    never push a wrench...

  10. #10
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    Quote Originally Posted by ra2bach View Post
    yes, I have A5 with EMOD stocks on a couple guns and the PA10 RE is the same size. the PA10 buffer is shorter than a carbine buffer though...
    Hmm, that's not the case with my PSA AR308. Buffer in my factory PSA rifle was the same as all my 5.56 carbine buffers
    Quote Originally Posted by Sigmund Freud View Post
    A fear of weapons is a sign of retarded sexual and emotional maturity.

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