9mm AR15
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Old 07-02-2014, 10:32 AM   #1
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Default 9mm AR15

I am thinking of getting a new AR15, what are the benefits of getting a 9mm VS 556? I was thinking the 9mm would not have over penetration, was told the right 223 ammo would have less penetration then the 9mm.

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Old 07-02-2014, 12:27 PM   #2
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9mm may be cheaper to shoot than 5.56.

9mm has more mass and I believe harder hitting because of the mass though it is slower.

Using hollow points will definitely reduce penetration of either round.

Others will be able to add more.

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Old 07-02-2014, 01:55 PM   #3
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ImageUploadedByFirearms Talk1404309282.160496.jpg
This should help
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Old 07-02-2014, 03:56 PM   #4
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So if I am going to do a SBR with a suppressor, would it be better with 9mm or 223?


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Old 07-02-2014, 04:12 PM   #5
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Default See the graph he posted

Look at the blue bars....16inch barrel - Its pretty clear which is the winner.

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Old 07-02-2014, 04:22 PM   #6
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Quote:
So if I am going to do a SBR with a suppressor, would it be better with 9mm or 223?
Might as well go with a pistol. You'd have a short barrel, and a pistol round, it's basically a pistol, just bigger. And hugely expensive. All that'd add up to $2K +.
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Old 07-02-2014, 06:17 PM   #7
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Quote:
Originally Posted by beltor View Post
So if I am going to do a SBR with a suppressor, would it be better with 9mm or 223?


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300 BLK wins the SBR battle.
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Old 07-02-2014, 07:54 PM   #8
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But then you have to either reload, or shell out big $$$ to shoot it.

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Old 07-02-2014, 08:17 PM   #9
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to me i see very little benefit by going with 9mm. you would save on ammunition cost. but whats the point of spending 2k or more on a firearm that will perform as good as a glock19 or xdm? with adding a suppressor your going to nullify the added benefit of the longer barrel. is having an ar in 9mm cool. yeah. but worth the hassle if there are better caliber options? not to me.. but hey its your money.

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Old 07-02-2014, 08:46 PM   #10
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The AR was designed for rifle ammo. I am not even sure a 9mm round can reliably cycle a DI gas system, because most pistol caliber carbines are blowback. If the conversion includes changing the operating system, you end up with an AR lookalike, with a mag adapter. Dedicated pistol caliber semiauto carbines have better ergonomics, such as the magazine inside the grip.

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