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Discussion Starter #1
So I'm building an SBR right now in 9mm with a 10.5 inch barrel. (because I have silencer for that caliber already) I was wondering which would be more effective in a CQB situation (25 meters or less) a 556 round or a 9mm out of the pre described length barrel. I google searched it and found no definitive answer. So I came here. Just wanted some thoughts from you guys.

Thanks

O by the way I'm thinking a 147 grain 9mm would be best in the described distance.
 

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Many SWAT teams have switched to 5.56 from 9mm, in carbine length firearms that might tell you something.

I'd personally go with 5.56, I just like the round better. Though, with a SBR, even with a silencer, you will get a heck of a bang. Googled it too, didn't find anything definitive, but looks like a lot of people prefer the 5.56 over the 9mm in the shorter barrels.
 

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5.56 has much better stopping power also more flash, noise and over penetration.
 

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5.56 has much better stopping power also more flash, noise and over penetration.
I think you're wrong, but ... Got any proof to back this up (using modern defensive ammo) ?
 

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The 9mm round has the advantage of being quieter and cheaper to shoot.
The 5.56 has WAY more stopping power but at the cost of being quite a bit louder.

If cost is no object and your looking for just, the best suppressed CQB round in an AR, I would suggest the 300 whisper.
300 Whisper ® | SSK Industries
 
Jeff
 

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Won't a even suppressed supersonic round like the 556 still "crack" loudly ?

If you want a quiet gun, then it would seem a sub-sonic 147gr 9mm would out perform the 556 when both are traveling at the same sub-sonic speeds. At full speed - the 9mm is left in the weeds by the much more powerful 556!
 

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5.56 has much better stopping power also more flash, noise and over penetration.
Right on flash.

Wrong on overpenetration. At in-house distances, most defensive-use .223/5.56 rounds will yaw and fragment upon hitting walls it'll still go through a few, though...just fewer than 9mm). 9mm will just keep blowing through walls.
 

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Sounds good.
 
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