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Thread: The VLTOR A5 thread - what doesn't it work with?

  1. #131
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    Quote Originally Posted by HD1911 View Post
    Gotcha. I believe the Standard is the A5H2. I'll give that a shot with the DD 16" Mid.

    What spring were you running?
    not sure on the port sizes, but ive got a bcm 16 mid that locks back on pmc bronze w/ a5h3 and sprinco green. ill need more time to verify if its 100% as ive been shooting mostly suppressed, but im not losing sleep over it. i think an a5h2 w/ sprinco green would be perfect for an unsuppressed 16 middy. i bet the dd's got a bigger port though and maybe it's crying for an a5h3 :P

  2. #132
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    Quote Originally Posted by Iraqgunz View Post
    SIONICS C158 MILSPEC bolt with NP3 finish.
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  3. #133
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    http://sionicsweaponsystems.com/stor...id_product=138

    Quote Originally Posted by BufordTJustice View Post
    And googling now......



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  4. #134
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    Thank you.
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  5. #135
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    So I finally got around to trying a different buffer in my A5. An A5H2 has sat in my wife's BCM middy for over a year but this weekend I put in an A5H3 to see if it's work with the Remington UMC 223 I've been using. I figured it's a weaker load so I wasn't expecting to to cycle but it had no issues through the few rounds I did put through it. I think there was slightly less recoil but both of us noticed that the buffer system now sounds very springy, like a cheap AR or a heavily used, issued Colt would. Is that normal? I'm not really worried about it but didn't expect to hear it.


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  6. #136
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    It may sound counterintuitive, but sometimes the added delay in time from a heavier buffered A5 can let the barrel depressurize to a point that less work is needed to cam over/ unlock and extract and fully cycle. It's a difficult balance to find at times, but it can work out that way. Many carbine action systems with low reciprocating mass actually need more gas to run.

  7. #137
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    Quote Originally Posted by tom12.7 View Post
    It may sound counterintuitive, but sometimes the added delay in time from a heavier buffered A5 can let the barrel depressurize to a point that less work is needed to cam over/ unlock and extract and fully cycle. It's a difficult balance to find at times, but it can work out that way. Many carbine action systems with low reciprocating mass actually need more gas to run.
    So you're saying it may just be because the heavier buffer has slowed the system so much its more noticeable?
    Last edited by Wake27; 07-06-15 at 19:36.
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  8. #138
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    The timing of the events are very brief, when recording the carrier velocities. On a rifle like action system, carrier velocities do not necessarily mimic the linear line of the addition or reduction of small, but equal increments of mass. Many times when represented graphically there are not necessarily plateaus, but a reduction in angle of reduced velocities. Sometimes the balance that happens between porting size, reciprocating mass, port location, etc seems more difficult, as the base system does not have enough dwell time for the carrier free space before unlocking for all of the possible combinations, nor is there space to provide it in the existing system. The graph is worse with a carbine action.

  9. #139
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    Quote Originally Posted by tom12.7 View Post
    It may sound counterintuitive, but sometimes the added delay in time from a heavier buffered A5 can let the barrel depressurize to a point that less work is needed to cam over/ unlock and extract and fully cycle. It's a difficult balance to find at times, but it can work out that way. Many carbine action systems with low reciprocating mass actually need more gas to run.
    I've felt this to be true also.

    This could help explain why so many barrel mfgs seem to over size gas ports when "tuning" for the cheapo 3 oz CAR buffer.
    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
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    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
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  10. #140
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    Quote Originally Posted by Wake27 View Post
    So I finally got around to trying a different buffer in my A5. An A5H2 has sat in my wife's BCM middy for over a year but this weekend I put in an A5H3 to see if it's work with the Remington UMC 223 I've been using. I figured it's a weaker load so I wasn't expecting to to cycle but it had no issues through the few rounds I did put through it. I think there was slightly less recoil but both of us noticed that the buffer system now sounds very springy, like a cheap AR or a heavily used, issued Colt would. Is that normal? I'm not really worried about it but didn't expect to hear it.


    Sent from my iPhone using Tapatalk
    The "springy sound" could be what you sense when the action is moving pretty slowly and moving sensibly after the shot.

    The opposite of that is when things move so fast, you sense them as one event.

    Where was ejection to? 4:00 plus?

    Between ejection angle, feel and sound, you should be able to get a feel for how quickly the action is cycling and if you need more/less buffer or gas drive.

    I'd probably drop back to the A5H2 and call it good.
    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

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