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Thread: Muzzle device

  1. #1
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    Muzzle device

    New to the forum, I checked around and can find similar discussions but nothing answering my question. I am putting together a 300 blk sbr, 8.5", to run both suppressed, using an AAC 762-SDN-6, and unsuppressed. I have found plenty of info stating at that length I should go with a brake. My question is the brakeout 2.0 improved enough from the original that I can use that and run unsuppressed without sending those around me into a coma from the force? I love the idea of the combo but the original just wasn't good enough based on all the reviews I read. Or should I just stick with a brake?

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    Running a thirty on that short of a barrel, you really need the blackout baffles to help extend the life of the suppressor internals. I use the original, and am not familiar enough with their 2.0 version to offer a definitive opinion as to the differences. That being said, I worry more about my equipment than shooters next to me. I do try to go to the end bench when at a public range, and shooting un-suppressed. I want to be as courteous as possible, but I don't buy parts so others can be "comfortable". Really wish I could be more help on your actual question. I looked at their (AAC) website and the current photos shown for the 51-T Blackout devices look like the ones I am using - photo below is on one of my uppers (purchased and installed a month ago) - it looks exactly like the first one I bought three years ago.

    Edit: Sorry !! I re-read your question; and on the first pass I read "Blackout" instead of "Brakeout". I was looking on their website for a version 2.0 of the Blackout ! I did purchase a Brakeout (original) for the Colt LE6920 - shown in the second photo. It is used mostly un-suppressed, but all the uppers have mounts on them so I can put a can on if I want to. Now that I have my head pulled out of its' normal resting place, I can comment. Unfortunately the comment is - I really can't tell a lot of difference. The first baffle on the Brakeout sends all the noise your neighbors can stand. I think it would require a decibel meter appropriately placed to the side for a definitive reading on noise levels. The human ear (spell that anyone shooting near you) will hate them equally. Hard to imagine that putting a taper on the prongs would help enough to be able to tell a difference. That plays back to my personal thought - buy a mount that helps the suppressor. Extra baffles for the initial fireball do work ! I would strongly recommend the Blackout.

    I apologize for any confusion the first comments may have caused.



    Last edited by Jerry R; 06-06-15 at 14:51.
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  3. #3
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    That's what I was afraid of. I know it will be a headache and loud but honestly, it will stay suppressed 90% of the time so I don't care about that part. I want to prolong the life of the can. Thanks for the info!

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    When running subs in 300blk, do you really need to worry about blast hurting your baffles?

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    No clue, That's part of why I asked the questions lol

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    Quote Originally Posted by MegademiC View Post
    When running subs in 300blk, do you really need to worry about blast hurting your baffles?
    Actually, while the projectile may be sub-sonic the fireball is expanding at approximately 47,000 FPS (read that somewhere dealing with suppressor efficiency - and I think memory is good, or at least close). Anyway, that speed is a physics constant that can be used in formulae. Some cartridges are louder than others because their "fireball" is larger - and that larger energy mass breaking the sound barrier causes a louder sound. That is what the suppressor is trying to contain. What you hear when a cartridge is fired is the fireball exceeding the speed of sound (significantly). The bullet "crack" when supersonic is only a small portion of the noise. So, IMO the fireball (and its' heat at speed) is what you are protecting the suppressor's first baffle from. Hope this helps.
    Last edited by Jerry R; 06-06-15 at 19:06.
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    Ok, I get that (velocity seems quite high, but I digress). However, pistol calibers don't seem to cause an issue with ss baffles. 5.56 does, especially in short bbl due to high pressure and combustion, even with inconel baffles. Where does 300 blk subs fall between those?

    Edit : perhaps we should be looking at muzzle pressure? Has anyone seen baffle wear from 300blk subs?
    Last edited by MegademiC; 06-07-15 at 10:43.

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    Quote Originally Posted by MegademiC View Post
    (velocity seems quite high)
    I agree. I saw it as a "constant" in a formula. I am trying to locate it.
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    Quote Originally Posted by MegademiC View Post
    Ok, I get that (velocity seems quite high, but I digress). However, pistol calibers don't seem to cause an issue with ss baffles. 5.56 does, especially in short bbl due to high pressure and combustion, even with inconel baffles. Where does 300 blk subs fall between those?

    Edit : perhaps we should be looking at muzzle pressure? Has anyone seen baffle wear from 300blk subs?
    Honestly, I never thought about the differing pressures of the round combined with the length and associated issues. I was only looking at it from a standpoint of shorter barrel length=more pressure release always. Good point. I will look for specifically 300 blk sbr pressure info and let you know what I find.

  10. #10
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    I have an AAC 9" 300 upper w/AAC Blackout with approx. 1700 rounds suppressed (762-SDN-6).

    Approximately 400rds subsonic with the rest std velocity loads ( 110rgr FMJ w/19.0 gr 296 @ 2100fps ).

    The Baffles all look pristine and have no evidence of premature ware like one would expect from 5.56 SBR.

    From everything I've read and experienced a brake is not needed.

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