Yes 12.5".

I believe they also have there own chamber. I cant remember what they called it. Mod I or Mod II. I cant remember


6.8 Barrel Length Specifics
Size Gas System Weigth Twist Rate
7.5" Pistol 19oz 1 in 12"
8.5" Pistol 20.6oz 1 in 12"
10.5" Carbine 24oz 1 in 12" or 1 in 12" polygonal
12.5" Carbine 28oz 1 in 12" or 1 in 12" polygonal
13.7" Carbine 29.4oz 1 in 12"
14.5" Carbine 31.5oz 1 in 12"
16" Mid 34oz 1 in 12"
18" Mid 37oz 1 in 12"

I think I'll get a 6.8 is seems more efficient and flatter shooting then a 300aac. Didn't want to start a huge debate but just wanted the brass nuts. So if I have an ar15 upper with bcg I would need a 6.8 barrel, bolt, and mags then I would be good to shoot?

You will be gtg. Although depending on barrel profile you may need a new gas block and muzzle brake. What mags you going with? Barrett mags worked great for me.


Maybe someone will chime in. Its been a lil bit since I built an upper

I never said the 300blk is something it's not. The OP asked for a round that will kill deer and hogs within 150 yards and the 300blk does that and does it well. You clearly have no first hand experience with it, only an opinion based on numbers on a screen. Based on numbers, a .22LR is bad for killing pigs but people do it all the time.
And you are wrong about the brass or bullets. There are tons more 308 bullets made and available than 6.8. 7.62 is used all over the world and produced by countless companies. And any 223 or 5.56 brass is easily resized into 300blk brass. So 300blk brass is easy to obtain for reloading.

Yes

http://ar15performance.com/inc/sdetail/14400 <-- that's a very good option if you want 16". Add the bolt and you're gtg for $272

It's literally impossible to discuss pros and cons of different chamberings in a sober minded and objective way. It's probably because of your mom.

hahahahahahahahahah

Or should I just stick with my 556 and start shooting heavier bullets. It's 1 in 7 twist barrel. Just spend the money on a decent scope?

it was a joke highlighting how absurd the arguments can get.

That would work too. All three options will work. They have their pros and con's. Its all about what you want. We will argue over all the little differences. I'd go 6.8 it sounds sexier. 300 you gotta blackout her face for a reason.

If you really want this to be a hunting rifle? I'd bite the bullet and get a 6.8 upper.

Given the right shot and the right bullet (Partition, TSX, Sirocco, TBBC, etc), yes a .223 can kill a deer.

Is that the best option in the platform? Certainly not.

Yes, go out and buy some decent glass either way. Primary arms is a great value (4-14FFP for $230 iirc) and they're based in/around Houston.

Certainly could do that.

http://buybergerbullets.3dcartstores.com/22-Cal-90-Grain-Match-VLD-Target_p_37.html

Big ole .224 pill there. You could go in search of lands and decide even, .005", .010", .015", ect. jump, but in the end you may be stuck with loading them to mag length. They'll be leaving slower, but they'd be pretty potent, I'd think. Always wanted to try that bullet in something.

.270 Win is produced by the tons. Your view is like me stating .300 blk bullets are hard to find but 30-06 bullets aren't. 300 blk brass isn't easy to obtain. 5.56 brass is, but your average shooter lacks the skills to make it.

YOU were talking about reloading.

I'm pretty sure I am not the one who keeps looking "worse" in this discussion.
The average reloader can easily resize 5.56 brass to make 300blk brass. There is a lot more 5.56 brass in the US than probably any other centerfire brass. But if you want to talk just about buying ready to go 300blk brass, then yes, it is easy to obtain.

FYI
Hornady is introducing a new 100g load using the GMX in the 68

http://www.ar15performance.com/

Harrison probably has the best 6.8 barrels and bolts.

Sometimes...

He makes good stuff
I have had two of his barrels

To clarify, when he has them in stock. Most of the time he sells out in short order.

Because of?????

They are accurate barrels. He probably had one of the best 6.8 spc I knew of.

No, I absolutely agree. I want one of his barrels. My tongue-in-cheek point was that he has the best barrels only when he has them in stock. Because of his reputation, his barrels sell out pretty quickly.

My dry sense of humor doesn't always come across well in digits.