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Thread: 308 sbr gas system length

  1. #1
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    308 sbr gas system length

    i am starting to narrow down my build and getting hung on the barrel decision.

    i originally wanted a 13.5 middy, but no one makes one. aero makes a 12.5 carbine. i know it's going to cost a bit more money (extra cost for the barrel and the cut/thread job), but i am considering getting a 16" middy and having it cut to 13.5 to get exactly what i want. any reason not go with a 13.5 middy? my reasons for the 13.5 middy is a bit more velocity and a smoother operating gas system. or am i being too picky?

    build details:
    aero m5e1 enhanced upper
    aero lower
    SLR agb
    saker 762
    Last edited by corey4; 02-15-19 at 09:31.

  2. #2
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    In case you weren't aware, if you use an A5 RE with a 308 AR, it needs a carbine length buffer. This is due to the extra length of the 308 carrier.
    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

  3. #3
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    Yes, and vltor also suggested a certain armalight spring as well.

  4. #4
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    Unsolicited advice, but I highly recommend against going under 14.5 with .308, and under 16" only if the user has a specific niche application and/or is shooting very light projectiles at at least moderate velocity.
    Quite frankly (again, unsolicited, I know) if I had a need for a 13.5" .308, I'd buy a SCAR-H and the CQC barrel. I promise that it will save you a lot of headache.
    Dropping under 16" of barrel makes a significant detrimental effect to ammunition performance, and while I like my 14.5" SR-25, I am demonstrably more efficient with my 16" guns.
    Now, change that to a 13.5"-14.5" 6.5mm CM or .260 Rem and I will sing a different song, but that's better left to another thread.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

    Director of Training

    FB@ Facebook.com/F2SConsultingLLC
    As accurate as needed, as fast as possible, as many times as it takes.

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    i have a scar17 and i'm not really warmed up to it for some reason. i played with a buddies 12.5 308 SBR and liked it much better over the scar17. i have a seekins sp10 and like that much better as well over the scar17. i know, different animals and different uses, but im preferring the AR large frame animal.

  6. #6
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    Quote Originally Posted by corey4 View Post
    i have a scar17 and i'm not really warmed up to it for some reason. i played with a buddies 12.5 308 SBR and liked it much better over the scar17. i have a seekins sp10 and like that much better as well over the scar17. i know, different animals and different uses, but im preferring the AR large frame animal.
    I gotcha, just warning that 7.62 DI guns under 14.5" tend to be finicky.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

    Director of Training

    FB@ Facebook.com/F2SConsultingLLC
    As accurate as needed, as fast as possible, as many times as it takes.

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    Quote Originally Posted by Failure2Stop View Post
    I gotcha, just warning that 7.62 DI guns under 14.5" tend to be finicky.
    Would you say the 14.5" SR25 uppers are finicky at all? If you don't mind, can you elaborate on how you are more efficient with the 16" variants?

    Thanks in advance

  8. #8
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    Quote Originally Posted by w3453l View Post
    Would you say the 14.5" SR25 uppers are finicky at all? If you don't mind, can you elaborate on how you are more efficient with the 16" variants?

    Thanks in advance
    Luckily the 14.5 SR-25s benefit from the last few years of focused system optimization, and they run right along with the 16" guns (and better than even our legacy models of 16" guns).
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

    Director of Training

    FB@ Facebook.com/F2SConsultingLLC
    As accurate as needed, as fast as possible, as many times as it takes.

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    Quote Originally Posted by Failure2Stop View Post
    Luckily the 14.5 SR-25s benefit from the last few years of focused system optimization, and they run right along with the 16" guns (and better than even our legacy models of 16" guns).
    That is good to hear, thanks.

    Was there a thread here specific to the 14.5" SR25 uppers? I thought I read through it a while back, and now I don't see it when I search. I had a few more questions specific to the 14.5" vs 16", but don't want to hijack this thread.

  10. #10
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    Hijack away my friend

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