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  1. #1
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    Default Subsonic 300 blackout versus pistol calibers in short barreled PDW and SMG

    There is a thread here on how glock magazines are not really compatible with AR15 frames, but we know the 300 blackout with standard AR mag works very well with the AR platform.

    Question: is there any superiority of the 9x19 Luger load versus a subsonic 300 blackout? When subsonic the 300 blackout is just a little faster than the .45 acp. Since I am now into the AR platform, I would like to stay with it for my choices as much as is practical.
    One who hammers his gun into a plow plows for those who do not....Unknown
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  2. #2
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    9mm has a better choice of expanding bullets vs. subsonic .300 blk. Subsoinc .300 penetrates better. That's about it as far as I can tell. There are a couple choices with a couple more coming for expanding subsonic .300. Subsonic .300 isn't that loud. Especially out of a 16" barrel.

    Some might say muzzle blast but I don't find it to be a big difference. Even in an enclosed shooting area. Last month I was shooting some .300blk 125 super sonic loads and the guy in the bay with me thought I was shooting suppressed 9mm because after the bang he could still hear the round wizzing through the air down range.

    Add a can and things become even more overlapped.

    Add full auto and they are the same in handling.
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  3. #3
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    My opinion -

    The AR Platform is best with 5.56 and 300 BO. Not with 9mm. 300 BO has the distinction of having so many loads for it that you can go slow and silent for indoors and fast and loud outside. The super sonics come close to the 7.62x39.

    You want a 9mm, get a dedicated 9mm sub gun equivalent like an EVO, or similar.
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  4. #4
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    IMO the best use for a 9mm AR is as a range training tool. Set it up just like your rifle caliber as an understudy. It can be used in ranges where rifle calibers aren’t allowed. More pleasant to shoot indoors, useful for training other members of the family, etc.

    I haven’t set one up that way because it’s not high on the priority list. But I think it makes some sense and is the only use
    I would have for a 9mm AR.

    For social work I would rather have a real sub gun.
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  5. #5
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    Quote Originally Posted by Brent Yamamoto View Post
    IMO the best use for a 9mm AR is as a range training tool. Set it up just like your rifle caliber as an understudy. It can be used in ranges where rifle calibers aren’t allowed. More pleasant to shoot indoors, useful for training other members of the family, etc.

    I haven’t set one up that way because it’s not high on the priority list. But I think it makes some sense and is the only use
    I would have for a 9mm AR.

    For social work I would rather have a real sub gun.
    Off topic, but what you think of the .22 conversion kits for the AR as training aids.
    One who hammers his gun into a plow plows for those who do not....Unknown
    ...at the end of the day its not about anything else but YOU AND YOURS..... Gabe Suarez
    ....WANT not NEED is what America is all about. ..... Gabe Suarez
    Its not about how fast you can load, but about how well you can shoot ..... Someone being saved by a speed load is not something that has happened with any regularity. Gabe Suarez

  6. #6
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    Quote Originally Posted by barnetmill View Post
    Off topic, but what you think of the .22 conversion kits for the AR as training aids.
    I have a Smith 22 that I have never even shot. They make some sense as an under study weapon but... honestly I have only ever used my actual ARs. I think there is some value if you set it up right. Though today I think I’d rather just set up a specialty 10/22.

    All depends on on what you use em for I suppose.
    Brent Yamamoto
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  7. #7
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    Quote Originally Posted by Brent Yamamoto View Post

    For social work I would rather have a real sub gun.
    Enlighten me on this?

  8. #8
    My first post here. Buddy pointed me in this direction as you are talking about just the question I'm having.

    I'm interested in understanding thoughts on the relative pro and con of 300blk subs vs 9mm for CQB. Ignoring the platform for the moment. Just considering raw terminal ballistics.

    You are at home and The Good Lord has given you the privilege of a home invasion. Would you pickup the MP5 or the Sig Rattler loader with subs. Both have a can on them.

  9. #9
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    Quote Originally Posted by Brent Yamamoto View Post
    More pleasant to shoot indoors.
    Having stood arms length away from parallel with the muzzle for both 9 and 300 (sub and super) in semi and full auto the blast difference isn't noticeable enough to me or those whom were with me. A super has about double or a little more powder charge, of the same type of powder, then a 9mm and a sub is a grain or so more for .300blk. Its a benefit of how efficient the .300 blk round is. It could be similar to the difference of a standard 9mm and a +P load.


    Quote Originally Posted by Brent Yamamoto View Post
    For social work I would rather have a real sub gun.
    Between a 9mm AR and a 9mm SMG? Agreed. For me to choose a 9mm smg over a .300 blk pistol the smg would have to fit a niche I need like fitting into a tiny case, nook or something like that.

    I have had the benefit of shooting a bunch of SMGs (full and semi) and a bunch of .300 blk in semi and full auto. I even had the chance to shoot a full auto mp5SD side by side with a full auto AR15 SBR w/can in .300blk. The mp5SD was a tiny bit more quite when standing next to the gun and shooter but at 10 feet they sounded the same.

    Some might think I am crazy but this is what a small group of us concluded after a bunch of side by side comparison.
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  10. #10
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    IDK, I think the real advantage of 300Blk, is that it can fire both super and sub. In super its a good killing round. In sub its quiet and reaches further than pistol calibers. There are places for 300 in super and sub sonic and places for a SMG. I still have a place in my heart for SMGs (semi and select), and Id probably opt for a SMG more often than most (if I could find a good 10mm SMG option, Id choose that even more); but a 300Blk AR is a lot more versatile for most folks under most situations.

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