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Thread: Help me spec my first SBR

  1. #11
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    Check out GandR Tactical; Grant gets great reviews and he carries a lot of what you might be looking for. He's pretty knowledgeable on things such as these.
    This Thread that he started, is full of WIN with regards to setting up an SBR intended for full time, or close to full time suppressed use.
    The advice above is worth exactly what you paid for it.

  2. #12
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    Quote Originally Posted by zk556x45 View Post
    For example, I've read good things about AAC cans and have given some thought to running a Blackout FH.
    I have an AAC M4-2000 that is on an LMT 10.5in 90% of the time and I'm very happy with it. I run it with an H2 and a sprinco enhanced blue action spring, and it has proven to be reliable.
    Last edited by Omega_556; 04-05-11 at 23:36.

  3. #13
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    Awesome. Thank you all.

    zk

  4. #14
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    I would agree with markm about the A5, except that I used standard parts (LMT Receiver extension, and Colt H3 buffer - 5.6 oz. Though it's really designed for a standard H buffer.) for my suppressed SBR build(s) because

    A - KAC guns come standard with LMT Receiver Extensions
    B - I can ALWAYS get parts for it, if it shits the bed
    C - It was easier to get a dedicated port size for it.
    D - Wasn't out yet, and there was no real way for me to measure a good port size for it for suppressed use.

    One consideration with suppressed guns, is port size. My only completed suppressed gun will not lock the bolt back on the last round when unsuppressed.

    It's giving the exact amount of gas I want when suppressed.

    Consider FailZero parts. And find Grant's thread ''Best Suppressed SBR Ever''

    ... Actually... here it is. It's bookmarked on my computer.

    https://www.m4carbine.net/showthread.php?t=33743

    As long as the suppressor is KAC, AAC, SureFire, or Ops. You should do fine.

    I'd ditch the BattleComp and go with a Muzzle brake suppressor mount.
    Last edited by Magic_Salad0892; 04-06-11 at 10:55.
    We miss you, AC.
    We miss you, ToddG.

  5. #15
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    Quote Originally Posted by hatidua View Post
    The appropriate buffer, in my wee little opinion, does away with any Switchblock need.
    I don't know of any buffer that reduces cyclic rate and recoil nearly as much as the proper size gas port. (and if there was it would not be reliable without the silencer) Needed? No, an AR will usually run pretty well without one but I would choose a Switchblock for 90% suppressed use for the recoil reduction alone.

    For mainly suppressed use the MB is OK, as long as you will never need to shoot it without the silencer and earpro.

  6. #16
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    I would only choose the switchblock if I was going between 50-70% suppressed.

    Under 50, just get a heavier buffer.

    More than 70, just get a smaller port.

    It is a product that is very much needed in the market. But does not fit my mission.

    Beats the hell out of that stupid JP gas block.

    I want to see if I can optimize one of my SBR's with a KAC CAR buffer (3 oz). And get even less gas, and less recoil. (With LMT Enhanced Carrier, and FailZero Upper, and probably get the Carrier Nickel Coated.)

    My current completed Suppressed (Semi-Dedicated) SBR mimics Grant's operationally.
    Last edited by Magic_Salad0892; 04-06-11 at 12:13.
    We miss you, AC.
    We miss you, ToddG.

  7. #17
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    Great info, guys.

    How does one go about getting a barrel that's drilled with a smaller gas port? Grant, is that something that you can help me with when the time comes? Is a smaller port a "custom" option on BCM barrels?

    If I get a smaller port and want to run the gun unsuppressed, is that accomplished by swapping out a lighter buffer/spring as needed?

    zk

  8. #18
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    I would get a 20'' barrel, with 12.5'' Rifle Gas system and have a reputable shop like ADCO, cut the barrel past the gas port. Then BOOM no gas port, free to drill a new one. Maybe Grant could help you.

    Yes, switching buffers could be the answer. But as long as it cycles the ammo it will be fine. You don't need to lock back unsuppressed, most combat rifles in the world don't lock back anyway. Just get used to it. IMO, YMMV, and all that.
    Last edited by Magic_Salad0892; 04-06-11 at 12:48.
    We miss you, AC.
    We miss you, ToddG.

  9. #19
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    It's not that the bolt doesn't lock on an empty mag, it's that not locking is a symptom of low carrier speed. Low carrier speed makes the rifle more likely to fail when under lubed, dirty, very cold, shooting positions that allow the rifle to free recoil, or with under powered ammo.

    I like the dedicated suppressed gun, but only if the 30% unsuppressed you shoot with it is only done on the range.

  10. #20
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    A properly setup gun would not have that problem.

    Mine does have a low carrier speed, but I still cycle reliably 100% of the time. When Suppressed the bolt does lock back, unsuppressed I can still cycle.

    This is with an LMT Enhanced carrier, and FailZero Stripped Upper Receiver.

    With smaller ports, the gun wouldn't get too dirty, and coupled with a low friction coefficient would still be able to cycle reliably.

    Very much like Grant's, who's guns were the build model for mine. (Mostly)

    Would you agree?
    We miss you, AC.
    We miss you, ToddG.

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