Aac sdn6

[Gober13]

I was thinking about building a 7.5" .223 upper. Read on a few forums that aac warrenties them down to 7.5" but on other sites it says 10". On a side note. I read that .223 has less pressure than 5.56 and is more the same as .300 blk. If i was to stick with .223 would it be safe? Thanks

 

[Red Dawn]

I've looked for barrel lengths for the round and only see the 10" for 556. There are many reasons why the min standard was set. I think you're a numbers guy so you'd appreciate the read HERE I went with a 11.5" for my next build after reading this one and a couple others on terminal velocity and stabilizing the round at distance.
I'd contact AAC further to answer other questions or concerns you have.

 

[chance]

I would avoid a 7.5” 223 upper. Ive seen way too many with reliability issues and some werent even stabilizing 55gr ammo

 

[Leshaire]

11.5 is the sweet spot for suppressing

 

[Cudruln]

Another vote for an 11.5". It is going to yield the best results for shooting suppressed

 

[Gober13]

Well i was leaning towards a 10.5" a2 upper but might have to look at 11.5". Is there really a big difference between the 10.5 and 11.5 for suppression wise?

 

[Red Dawn]

I would look into the gas port diameter !!

 

[Red Dawn]

This was a list put together and pulled from another site but should help get you closer to a decision.

KAK Industries 11" bbl with carbine gas is .084 - .086"
Mega Arms 10.5" bbl with carbine gas is .080"
Green Mountain 10.5" bbl carbine gas is .087"
Anderson 10.5" bbl carbine gas is .086"
Ballistic Advantage 11.5" bbl carbine gas is .073"
Ballistic Advantage 10.3" Hanson bbl carbine gas is .076"
Ballistic Advantage 10.5" bbl carbine gas is .078"
Aero Precision 10.5" bbl carbine gas .0785"
Faxon 10.5" Gov't/Socom bbl with carbine gas is .080"
Faxon 11.5" Big GUNNER bbl with mid-length gas is .110"
LMT 10.5" bbl with carbine gas Crane spec'd at .070"
PSA 10.5" bbl with carbine gas is .081" - .089"
Integrity Arms 10.5" bbl with carbine gas is .085"
Sionics RGP 11.5" bbl carbine gas is .063-.068 "
And this :

 

[Gober13]

This was a list put together and pulled from another site but should help get you closer to a decision.

KAK Industries 11" bbl with carbine gas is .084 - .086"
Mega Arms 10.5" bbl with carbine gas is .080"
Green Mountain 10.5" bbl carbine gas is .087"
Anderson 10.5" bbl carbine gas is .086"
Ballistic Advantage 11.5" bbl carbine gas is .073"
Ballistic Advantage 10.3" Hanson bbl carbine gas is .076"
Ballistic Advantage 10.5" bbl carbine gas is .078"
Aero Precision 10.5" bbl carbine gas .0785"
Faxon 10.5" Gov't/Socom bbl with carbine gas is .080"
Faxon 11.5" Big GUNNER bbl with mid-length gas is .110"
LMT 10.5" bbl with carbine gas Crane spec'd at .070"
PSA 10.5" bbl with carbine gas is .081" - .089"
Integrity Arms 10.5" bbl with carbine gas is .085"
Sionics RGP 11.5" bbl carbine gas is .063-.068 "
And this :

Awesome. Thanks! Nice list

 

[Righter13]

Be sure to look in mro the scionics 11.5” Reduced Gas Port (RGP)

I have one with an innovative arms mini Grunt and it’s a great suppressed setup.