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Thread: Importance of an adjustable gas block in a 308 build?

  1. #11
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    My thought is yes, use the adj. gas block on your .308.
    Either the SLR or SA's have worked for me and are good kit.

    The .308 ARs seem a bit more issue prone than their 5.56 counterparts in my experience.
    The ability to fine tune the gas system I see as an advantage with .308.

  2. #12
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    Just keep in mind, if the gas port is the right size, an adjustable gas block is useless
    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"

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  3. #13
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    Absolutely yes. The greater gas volume of the 308 class cartridges makes it necessary because one port size for suppressed will be undergassed for without and the right one for without will be way overgassed. 5.56 you can get away with fixed.

  4. #14
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    That's the $50,000 question. Mist.... is my BA the correct port size for my application. I tend to agree. I see gaijin's point, the 308 platform, DPMS variant in particular doesn't really have a seat at the "table of mil spec standards" like it's big little bro AR-15.


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    "Texas has yet to learn submission to any oppression, come from what source it may."
    ~ Sam Houston

    “The liberties of our country, the freedom of our civil constitution, are worth defending against all hazards: And it is our duty to defend them against all attacks.”
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  5. #15
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    Mine with an 18" BA Modern Series Government profile is definitely not over gassed with an Aero gas block. With an Aero carbine buffer and Tubbs spring, the carrier speed with foreign M80-type ammo is actually a bit slow. It works great with my handloads and 168 gr FGGM.

  6. #16
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    Quote Originally Posted by RobertTheTexan View Post
    That's the $50,000 question. Mist.... is my BA the correct port size for my application. I tend to agree. I see gaijin's point, the 308 platform, DPMS variant in particular doesn't really have a seat at the "table of mil spec standards" like it's big little bro AR-15.
    The only way to tell is to shoot the rifle. I haven't had the funds to fully explore tuning my M&P-10, but it short strokes on NATO spec ammo in the winter and runs fine on commercial spec ammo. Someday, I'm gonna have to gather up a variety of buffers and go see what happens.

    We can talk all day about saving money by getting the right parts from the start, but without actual testing and keeping notes, we'll never know which parts are right and testing costs time and money
    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

  7. #17
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    Quote Originally Posted by RobertTheTexan View Post
    That's the $50,000 question. Mist.... is my BA the correct port size for my application. I tend to agree. I see gaijin's point, the 308 platform, DPMS variant in particular doesn't really have a seat at the "table of mil spec standards" like it's big little bro AR-15.


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    Quote Originally Posted by grizzman View Post
    Mine with an 18" BA Modern Series Government profile is definitely not over gassed with an Aero gas block. With an Aero carbine buffer and Tubbs spring, the carrier speed with foreign M80-type ammo is actually a bit slow. It works great with my handloads and 168 gr FGGM.
    Rifle or midlength gas system?

    What is the port size now?
    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

  8. #18
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    Mine has a mid length gas system. I didn't measure the port.

    I get no failures with '80 Hirt and '16 MEN. When using a Magpul LR 10 round mag, the last round sometimes doesn't make it through the ejection port.
    Last edited by grizzman; 09-06-17 at 14:00.

  9. #19
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    Quote Originally Posted by MistWolf View Post
    The only way to tell is to shoot the rifle.

    We can talk all day about saving money by getting the right parts from the start, but without actual testing and keeping notes, we'll never know which parts are right and testing costs time and money
    Quote Originally Posted by grizzman View Post
    Mine with an 18" BA Modern Series Government profile is definitely not over gassed with an Aero gas block. With an Aero carbine buffer and Tubbs spring, the carrier speed with foreign M80-type ammo is actually a bit slow. It works great with my handloads and 168 gr FGGM.
    I've shoot a wide variety of ammo. From - - - Federal 175gr SMK OTM
    - Federal 168 OTM
    - TulAmmo steel case,
    - ZQi 7.62x51 147gr,
    - MEN 147gr MEN
    - Prefect 150gr

    The one ammo I had issues with was Hirtenberger 147gr. FMJ. I experienced several FTF, I'm got very hard firing pin strikes on the Bergen primer, but no bang. No other ammo has caused me problems before. Some of the ammo fired fine, some didn't.

    I haven't put a can on my .308 because it's still hostage, but the weapon cycles perfectly with all that ammo. Exception noted.






    Sent from my iPhone using Tapatalk
    "Texas has yet to learn submission to any oppression, come from what source it may."
    ~ Sam Houston

    “The liberties of our country, the freedom of our civil constitution, are worth defending against all hazards: And it is our duty to defend them against all attacks.”
    ~ Sam Adams

  10. #20
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    Quote Originally Posted by Clint View Post
    Rifle or midlength gas system?

    What is the port size now?
    18" rifle gas. Port size? No idea. I'll email Kyle and ask him.


    Sent from my iPhone using Tapatalk
    "Texas has yet to learn submission to any oppression, come from what source it may."
    ~ Sam Houston

    “The liberties of our country, the freedom of our civil constitution, are worth defending against all hazards: And it is our duty to defend them against all attacks.”
    ~ Sam Adams

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