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Thread: Vltor A5 not working in my M16.

  1. #31
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    Quote Originally Posted by Todd.K View Post
    The force needed to compress that spring is tiny compared to the force of the weights at the velocity the buffer travels.

    I'd say it's so the weights start from the same position shooting with the muzzle up or down.
    That's probably along the right lines.

    Thinking about the standard non spring setup, even during level shooting this applies.

    After the carrier has slammed shut and the weights have done their thing and bounced around, the position of the weights will be somewhat random.

    Also rough handling and running could move the weights around.

    When the next shot is fired, this random weight distribution could lead to inconsistencies in the BCG velocity during initial unlocking, which would translate into less reliability.

    *******

    I did some quick and dirty bounce tests yesterday.

    Hold the upper, pointed muzzle down.

    Retract the carrier up to it's full stroke and let go.

    A bare carrier bounces up about a 1/4" and sticks.

    Then set/double tape the different buffers on top of the carrier in their normal relationship.

    The CAR still allows bounce, but probably only an 1/8" and sticks.

    Both the H2 and A5 completely eliminate bounce as the final carrier pisition is fully closed.

    This test is not entirely accurate, as the impact speeds are different, but it provides some insight.
    Last edited by Clint; 03-03-11 at 01:03.
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
    BRT EZTUNE Preset Gas Tubes - CAR and MID
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  2. #32
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    Quote Originally Posted by Neo Mara View Post

    If you want to try a heiver buffer without paying for one you can disassemble both your H3 and A5 buffers and refill the A5 with 3-4 tungsten weights. 3 tunsten and 1 steel will be an A5H3 and 4 tungsten will be an A5H4. No need buy a new one. They can be a little hard to disassemble the first time they are done but when I reassemble I put a little Slip2000EWL on the plastic part as well and the next time its much easier to take apart.
    Ok, I did this, I am gonna try it with 6oz today. If that doesnt work I will just try a couple of different weights, and I have a wolf xp spring on order.

    Vltor has been very helpful while talking to them. So thanks to them.
    Last edited by RustedAce; 03-02-11 at 16:13.

  3. #33
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    Is the WolfXP spring a rifle or carbine spring? Remember, that A5 needs rifle springs.
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  4. #34
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    Quote Originally Posted by RustedAce View Post
    Also I found this thread on TOS, this guy has a A1 and Giselle trigger on his as well and was also having problems with A5. Maybe its some combo of those things. http://www.ar15.com/forums/topic.htm...=511032&page=1
    From that thread it sounded like he was using an EMOD on a CAR legnth RE and a CAR buffer which was likely the cause of his bolt bounce. It doesn't seem he ever ran the A5 on that gun, at least as far as that thread goes.

  5. #35
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    Quote Originally Posted by Neo Mara View Post
    From that thread it sounded like he was using an EMOD on a CAR legnth RE and a CAR buffer which was likely the cause of his bolt bounce. It doesn't seem he ever ran the A5 on that gun, at least as far as that thread goes.
    That is how I read it too.

  6. #36
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    Quote Originally Posted by Heavy Metal View Post
    Is the WolfXP spring a rifle or carbine spring? Remember, that A5 needs rifle springs.
    Rifle.


    I actually got it to run today with the 11.5 EXT barrel suppressed and unsuppressed/ PVRI ammo, using the buffer with weights changed to 6oz and the colt spring.

    Didnt bring any other uppers or ammo, on friday I will try it with other stuff.



    Quote Originally Posted by Neo Mara View Post
    From that thread it sounded like he was using an EMOD on a CAR legnth RE and a CAR buffer which was likely the cause of his bolt bounce. It doesn't seem he ever ran the A5 on that gun, at least as far as that thread goes.

    You guys are right, I read it wrong. Thought he got the A5 kit not regular emod kit, my bad.






    ETA: Went today and using the combination of buffer weights weighing 5.9oz and the colt spring I got it to run with all the uppers/ ammo I wanted it to run with.

    Thank yall for the help, and thanks vltor for the help.
    Last edited by RustedAce; 03-04-11 at 14:46.

  7. #37
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    Glad you got it running

    So that was it???

    One steel weight replaced by a tungsten weight and problem solved?

    Quote Originally Posted by RustedAce View Post
    Rifle.


    I actually got it to run today with the 11.5 EXT barrel suppressed and unsuppressed/ PVRI ammo, using the buffer with weights changed to 6oz and the colt spring.

    ETA: Went today and using the combination of buffer weights weighing 5.9oz and the colt spring I got it to run with all the uppers/ ammo I wanted it to run with.

    Thank yall for the help, and thanks vltor for the help.
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
    BRT EZTUNE Preset Gas Tubes - CAR and MID
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  8. #38
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    My A5/11.5 runs really well. I'm very puzzled by Rusted's issue.

    It makes no sense.... the rifle buffer is usually the easiest system to get running well.

  9. #39
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    Quote Originally Posted by Clint View Post
    Glad you got it running

    So that was it???

    One steel weight replaced by a tungsten weight and problem solved?
    Well that and the spring. It wont work with all the combos with the vltor spring.


    For all those talking about the little spring inside the buffer, I just left that in with no ill effect.
    Last edited by RustedAce; 03-06-11 at 21:57.

  10. #40
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    Quote Originally Posted by markm View Post
    My A5/11.5 runs really well. I'm very puzzled by Rusted's issue.

    It makes no sense.... the rifle buffer is usually the easiest system to get running well.

    What makes no sense to me is that it ran fine with the H3 buffer or regular rifle buffer system, but didnt run with 5oz A5.

    Whatever, it works now with 5.9oz of buffer and the colt spring.


    Very controllable. Think it slowed my cyclic rate down some too.
    14.5 barrel with wolf, which was actually the only combo that wouldnt run 100% with the H3. Works great now.
    http://www.youtube.com/watch?v=B2xwiDFJk_8
    Last edited by RustedAce; 03-06-11 at 22:04.

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