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Old December 23, 2016, 11:39 AM   #1
maverick8717
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omega 9k with .223??

I have an omega 9K in NFA jail at the moment, Silencer co does not rate it for .223 however it is rated for 300blk super sonic full auto out of a 10 in barrel. with 300 blk being of very similar pressure I am wondering what you guys think of shooting .223 out of a 16 in barrel at a max rate of 5-10 rounds per minute. I asked silencer co and they gave me the PR answer of "we don't rate it for .223", but I am looking for a more detailed answer, if not, why?
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Old December 23, 2016, 12:13 PM   #2
Theohazard
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Welcome to TFL!

Yes, .223 and supersonic 300 Blackout have similar chamber pressure, but that's not the main concern with a silencer; what really matters is the pressure at the muzzle. The .223 has a lot more muzzle pressure than a 300 Blackout supersonic does, and that's why a can like the Omega 9K isn't rated for .223.

Now, you would improve your chances by using a 16" .223 barrel and shooting at a slow rate, but you still might be putting more pressure on the silencer than if you shot it on a 10" 300 Blackout with supersonic ammo. Since I've never seen any data regarding the muzzle pressure of supersonic 300 Blackout, I don't know how long your barrel would need to be on your .223 for the two to have equal muzzle pressure.

Here's a chart on 5.56 muzzle pressures with varying barrel lengths. The problem is that I've never seen this info regarding the 300 Blackout; I know it has less muzzle pressure than the 5.56, but I don't know how much less.

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Old December 24, 2016, 05:23 PM   #3
Chainsaw.
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No way Hose A. If you want to play grab a cheap 300 upper with no BCG and use subs. Will give you all you want with out blowing out your $1100 suppressor.
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Old December 24, 2016, 09:26 PM   #4
maverick8717
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Thanks Theohazard, I have been looking as well and don't see any good info for what the muzzle pressure of 300blk would be. I looked at the 9k manual again and it is actually rated for 8 in barrel with super 300blk full auto. looking at how much pressures drop with barrel length I am quite confident it will be in a safe range, double the barrel length equals about half the pressure, and while .223 is higher pressure I doubt it is more than double, after all it has very close to the same amount of powder.

Anyway, I will continue my research however I think it looks like I will be just fine to run it.
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Old December 24, 2016, 09:32 PM   #5
maverick8717
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This appears to be a chart for 300blk, it would indicate over 10K at 8 in.

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Old December 26, 2016, 04:50 AM   #6
Theohazard
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That's higher than I expected. With numbers like those, you'd think that any silencer that could take a short-barreled supersonic 300 Blackout load could also take a 16" .223 load. Either I'm missing something here or maybe these numbers aren't all that accurate compared to real-world testing. Maybe, just like decibel ratings, muzzle pressure numbers are inconsistent and vary a lot from test to test.
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