11 inch barrel gas length?

[midnitesi]

My 12” Arc has a carbine length gas tube and it runs like a top. I would go with carbine.

I know those run great, Im more or less curious if the same rules apply to 6arc as they do with 556 and dwell time.

As always the answer will be it depends.

5.56 is running at 62,000 vs Arc at 52,000. The rules would be similar but not the same. Some differences that change the equation are case design, projectile weight, powder charge, gas port size, pressure and velocity.

Everything adds up to successful cycling of the action, or not.

I am running a +2 gas tube length on a 20” Bartlien barrel. I read about some people having issues with Varget in barrels with +2. In my case Varget loads run perfect from low to high charges. I have run mid length gas tubes on 5.56 guns down to 16”. Everything shorter I am running carbine or pistol length. But I am running cans on everything with one exception being a 18” competition gun.

On your 11” barrel you should be fine running a carbine length system that leaves @ 3 1/2” in front of the gas port. If you suppress it you may even need an adjustable gas block depending on your port size.

Good luck.

thanks for the info. I am running an 18 inch barrel with rifle gas (spr profile) and having no issues. that profile was a specific need for the mk12 clone. the shorty is not a clone persay. I am ditching the 10.5 300 black barrel and just pulled the string on a 12 inch faxon barrel in 6 arc. I was able to speak to some fellas that are using the arc operationally and they said they didnt have any issues with mid gas on the stuff down to 12 inches, but had issues sub 12. They are running 12 with carbine currently for their missions. cant go into more details, but after that i just pulled the trigger on a faxon.