Right barrel LENGHT for a 300 blackout

[Garryztopshop]

Looking for the best barrel LENGHT for my AR 308, twist rate , Garry

[shibiwan]

308 AR or 300 AAC AR?

 

Simple answer is 16" with pistol gas system for a 300 AAC (hard to find the right barrel) but it functions perfectly fine with a carbine gas system. 14.5" if you're OCD and pin on a proper length flash hider to make it 16". 1:7 to 1:8 twist is what you're going to find out there in 300 AAC.

 

Any less than that and you have to make it a pistol, or get the right forms for an SBR. Any longer than that and it won't work well.

 

P.S. Welcome to the forum!

Edited August 5, 2014 by shibiwan

[98Z5V]

Confusing thread title, compared to opening statement/question.

 

OP please clarify which platform you're really talking about here.

[Dane Armory]

Pistol 300 blk 10.5" to 11.5" with pistol gas syatem. Any thing shorter you will problems and cycleing issues.

[shibiwan]

Pistol 300 blk 10.5" to 11.5" with pistol gas syatem. Any thing shorter you will problems and cycleing issues.

 

Unless it's a Shibigun. 8.5" barrel runs like clockwork even when firing unsuppressed subs. :D

 

I should probably bring it to Mike's the next time you guys decide to waste ammo.

Edited August 5, 2014 by shibiwan

[shibiwan]

Confusing thread title, compared to opening statement/question.

 

OP please clarify which platform you're really talking about here.

 

He DID post in the 300 AAC subsection of the forum, so I guess it would be 300 AAC

Edited August 5, 2014 by shibiwan

[Dane Armory]

Unless it's a Shibigun. 8.5" barrel runs like clockwork even when firing unsuppressed subs. :D

 

I should probably bring it to Mike's the next time you guys decide to waste ammo.

Suppressed with an adjustable gas block !

Back to designed right or with bandaids to get it to function.

[shibiwan]

Suppressed with an adjustable gas block !

Back to designed right or with bandaids to get it to function.

 

Not for a 300 AAC. The design intent of the 300 AAC was to run subs and/or suppressed with no gas system mods so you can go back and forth without futzing with anything.

Edited August 5, 2014 by shibiwan

[Rsquared]

^^^^ Yep. No adjustable gas block on my 10.5 " Noveske barreled SBR. It shoots subs or supersonic without a problem.

[Dane Armory]

^^^^ Yep. No adjustable gas block on my 10.5 " Noveske barreled SBR. It shoots subs or supersonic without a problem.

Another example 10.5" and no problems !

If you go shorter the gas port size has to be experimented with , also buffer weights must be dailed in.

Just Sayin'

[shibiwan]

Another example 10.5" and no problems !

If you go shorter the gas port size has to be experimented with , also buffer weights must be dailed in.

Just Sayin'

 

Yes that's the part that makes or breaks it.

[98Z5V]

He DID post in the 300 AAC subsection of the forum, so I guess it would be 300 AAC

 

Doesn't mean anything.  Hell, we've got people asking for target dope for 50s in the "Accurizing the 308AR" section.   <dontknow>

 

 

 

I should probably bring it to Mike's the next time you guys decide to waste ammo.

 

Let's get it - I'll be back out there Thursday morning.  <thumbsup>

[shibiwan]

Doesn't mean anything.  Hell, we've got people asking for target dope for 50s in the "Accurizing the 308AR" section.   <dontknow>

 

Look at that dope!  LOL

 

Thursday... um gotta see how it pans out tomorrow. Trying to get the prototype M4 lowers machined this week so I can come out and play. :D

Edited August 6, 2014 by shibiwan