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Thread: Additional Vltor A5 Testing

  1. #1
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    Additional Vltor A5 Testing

    Went out the other evening with a couple of my associates and did some awesome night shooting with a full moon and excellent weather.

    Wanted to do some mix-n-matching with the Vltor A5 buffers and some of my AR's as well as theirs. As with all info it is best that you test your particular set up to ensure reliability.

    AR 1- Colt 6920 barrel with Vltor MUR-1 and a BCM MOD 0 comp. BCG is black ion bonded and has standard components. I have been using the A5 on this since it was built. It was was being run with the -3 buffer and green Springco spring. Thus far it has cycled 100% with the ammo that I shoot- M193/M855 to include clone ammo. Hornady 55/75gr. Steel TAP. PMC Bronze (supply is gone) and some of markm's handloads using 60gr. ballistic tips I scored from Midway.

    Last night decided to run it with the -4 buffer and Springco spring. It ran 100% with a variety of rounds. Fired an average of 10-15 rounds each of the various ammo.

    1. Magtech M193
    2. Hornady 55gr. Steel TAP
    3. 60gr. markm handloads (loaded slightly hotter than .223)
    4. Federal M193

    We know that the Colt 6920 has a proper port size (.063) so it is safe to say it isn't overgassed. It shot exceptionally smooth and no malfunctions were encountered.

    AR 2- FNMI 20" rifle barrel with Battle Comp 1.0. BCG is a standard BCG with standard components. This one was also built using the Vltor A5 with a -1 buffer and green Springco spring.

    Last night decided to run it with the -3 and -4 buffer and green Springco spring. It ran 100% with a variety of rounds. Fired an average of 10-15 rounds each of the various ammo.

    1. Magtech M193
    2. Hornady 55gr. Steel TAP
    3. 60gr. markm handloads (loaded slightly hotter than .223)
    4. Federal M193

    Again 100% feed and function. The combination of the Battle Comp with the addition of the -4 made it so incredibly easy to shoot and control is was ridiculous. You could literally fire this one handed and the rifle wouldn't move. This barrel has the standard .093 rifle sized gas port.

    AR 3- BCM 12.5" Kino upper with AAC 18T suppressor mount, LMT enhanced carrier, NiB cam pin and BCM bolt. This particular upper has had close to 8,000 rounds through it. The lower was also built from the beginning with the A5. This particular A5 set up came from the factory in Tucson and has been in use for just about 3 years (IIRC). It has always had a green Springco spring and -4 buffer since I primarily shoot it suppressed. Functioned 100% as it has, until I removed the suppressor at which time rounds #2 and #3 wouldn't cycle 100% (short stroked). Port size on this is around .076

    1. Magtech M193
    2. Hornady 55gr. Steel TAP
    3. 60gr. markm handloads (loaded slightly hotter than .223)
    4. Federal M193

    AR 4- BCM 11.5" BFH upper with AAC 18T suppressor mount, standard BCM BCG with an NiB cam pin. This upper is swapped around with the 12.5" routinely. It has approx. 12,000 rounds through it and has fired 100% with all ammo fired. It's using the same BCM lower with -4 buffer and green Springco spring. Port size on this one is also at .076.

    AR 5- This one belonged to my associate. It's a Noveske 14.5" middy with a Battle Comp 1.0. We dropped the upper onto a lower with the -4 and it ran 100% with M193 Magtech and Federal as well as the Steel TAP. I don't believe we tested it with the markm loads.

    Based on my previous shootings and observations if you are shooting a properly built and spec'd carbine with proper port sizes then I expect it should cycle 100% if you use the -4 buffer and green Springco spring. My associate remarked that he thought he felt a difference between the Springco and a standard GI rifle spring. I know that when I fired the Noveske middy it was also incredibly smooth and I could feel as if it was cycling slower.



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  2. #2
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    Once they come back to light, I will be picking up a -3 and -4 buffer to test on my setup. All my middy uppers (three 16" BCM's, one DD 16", a Palmetto 16" and an ARP 6.8 SPC 16") run fantastically with the -2 I currently have. Even with just the -2 you can tell the difference between it and one of my other lowers that is running a normal H buffer.

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    Outstanding post, IG.

    As I've stated before, if somebody's gun will function with the -3 or -4 buffers, there is a lot to gain in smoothness during cycling from the heavier buffers.

    Clearly, Vltor did a shitload of homework on this system....as it just fuggin works.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

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  4. #4
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    It does noticeably (slightly) slow the bolt down but other than that zero malfs w/my DD 14.5" CHF LW w/BCM Mod 1 comp or my BCM 14.7" standard profile middy w/Battlecomp 1.0.

    Got to shoot two 16" carbine gas guns w/standard and h buffer. The difference is impressive. Been a while since shooting a bone stock AR.Felt like the rifle was beating itself to death.

    Buford sold me the crack and I'm still hooked.

    -Jax
    Last edited by jaxman7; 05-27-13 at 23:05.


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    In the situation where you are waiting for your A5 buffer to come in, as in my case for the time being I have the standard BCM M4 buffer stock extension, spring , and H buffer. I have all components for the A5( Vltor A5 stock extension, green sprinco, extra castle nut and Noveske end plate), except for the A5 buffer. I want to replace the system when my A5 buffer comes in what would you guys do as far as torque value and staking with intentions on switching it out?

    IG I know I had talked to you before about the A5 weight I should run, if my memory serves me well I believe it was the standard A5H2 to start then maybe try the -3 if it will run it.

    This is the AR that I will be putting the A5 in: BCM BFH 16 inch middy shaved and taper pinned, BC 1, BCM BCG, Rainer lower, SSA. I do not think I will be shooting suppressed, at least in the near future.

    Ammo used or to be used is M193 or M855 LC
    Last edited by Blak1508; 05-29-13 at 21:16. Reason: Added usual ammo


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  6. #6
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    I think you can handle a -2 or -3. This is based on what we saw yesterday. Please remember that ammo is a factor as well.

    My goal is always reliability with all of the ammo I have and intend to shoot with the heaviest buffer I can manage.

    Quote Originally Posted by Blak1508 View Post
    In the situation where you are waiting for your A5 buffer to come in, as in my case for the time being I have the standard BCM M4 buffer stock extension, spring , and H buffer. I have all components for the A5( Vltor A5 stock extension, green sprinco, extra castle nut and Noveske end plate), except for the A5 buffer. I want to replace the system when my A5 buffer comes in what would you guys do as far as torque value and staking with intentions on switching it out?

    IG I know I had talked to you before about the A5 weight I should run, if my memory serves me well I believe it was the standard A5H2 to start then maybe try the -3 if it will run it.

    This is the AR that I will be putting the A5 in: BCM BFH 16 inch middy shaved and taper pinned, BC 1, BCM BCG, Rainer lower, SSA. I do not think I will be shooting suppressed, at least in the near future.



    Owner/Instructor at Semper Paratus Arms

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    For a Daniel Defense 12" upper with chf lightweight barrel, would you say it would probably be best to run an a5h3 buffer with green springco spring?
    Last edited by snackgunner; 05-28-13 at 03:58.

  8. #8
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    Maybe. But I don't know the port size or the ammo that you are shooting.

    Quote Originally Posted by snackgunner View Post
    For a Daniel Defense 12" upper with chf lightweight barrel, would you say it would probably be best to run an a5h3 buffer with green springco spring?



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  9. #9
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    Travis Haley ran his fastest 1-5 drill using a rifle equipped with a VLTOR A5 assembly and rifle-length gas system, and remarked how smooth it was.

    http://www.youtube.com/watch?v=9hXV-Buvs1Y
    Last edited by justin_247; 05-28-13 at 12:17. Reason: Grammatical errors.

  10. #10
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    Quote Originally Posted by Iraqgunz View Post
    Went out the other evening with a couple of my associates and did some awesome night shooting with a full moon and excellent weather.
    Markm and Pappabear?
    We miss you, AC.
    We miss you, ToddG.

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