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  • 12.5” – SA adj gas block or fixed gas block?

     Neville updated 11 months, 2 weeks ago 2 Members · 4 Posts
  • Neville

    June 13, 2021 at 10:21 am

    Building another 12.5 upper. Wanted to run a SA adjustable gas block since I’ll be running it suppressed and unsuppressed once my can gets out of jail.

    However, I’ve been seeing IG posts, stories, and videos from some people to not use AGB on something you’d potentially be trusting your life with.

    Depending how it turns out, this will be my primary upper that I run for taking classes, the range, and HD/SHTF.


    – Aero Threaded M4E1 upper
    – 12.5 Carbine Length Gas System SOLGW Barrel
    – VLTOR A5 system

    [View Poll](

  • RaccoonRanger474

    June 13, 2021 at 10:21 am

    Some AGBs should not be trusted. The SA is one you can count on assuming proper installation.

    With the A5 system and that particular barrel though it may be redundant and unnecessary to run an AGB. In this case I’d suggest going with a standard gas block and adjusting at the buffer to tune your cyclic rate.

  • Crotalus_Horridus

    June 13, 2021 at 10:21 am

    Just my opinion, but I prefer swapping buffer weights and/or springs over the AGB.

  • 11b68w

    June 13, 2021 at 10:21 am

    There’s always the option of setting it to where it just reliably cycles whatever ammo you line when dirty-ish and unsuppressed. Also, Black River Tactical makes gas tubes with fixed metering orifices.

    What can did you buy?

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