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View Full Version : Can you pair a Stag Arms 6.8 lower with a 5.56 upper?


chiburi
08-17-2011, 7:11 PM
Hi all,

I've been reading about folks who use a 5.56 lower with a 6.8 upper, but I'm curious, If I buy a rifle from a fellow calgunner, who has a 6.8 Stag Arms lower, can I pair it with a 5.56 upper and shoot .223? I don't want to have to buy 6.8 rounds to shoot - not what I'm looking for, but if I can use that lower, and shoot .223 through an AR15 upper, I'm golden.

Thanks all,

Chib

strangerdude
08-17-2011, 7:23 PM
Honestly I don't know for sure but I would be willing to bet that you can.

FFShooter23
08-17-2011, 7:26 PM
Yes. You can use that 6.8 lower. No difference between and 6.8 marked lower and 5.56 marked lower other than it's markings. I did it for a while until BRD took over and decided to get another lower. :D

Purple K
08-17-2011, 8:49 PM
Yes

chiburi
08-17-2011, 9:12 PM
so why buy a 6.8 and have all the confusion, if a 5.56 does the trick?

Chib

CSI304
08-17-2011, 9:21 PM
Most AR lowers are pretty much all the same, it just a caliber marking (engraving). Unless it is a pistol caliber (9mm/45acp) with a different hammer and buffer/buffer spring, I wouldn't worry abut it. From what I understand the only difference between 6.8spc and 5.56/.223 is the barrel and the bolt, every other parts can remain the same.

5.56/.223/7.62x39/6.8spc/6.5grendel and bunch of other calibers will fit in the mag well.
Now a days most manufacturers use "cal multi" instead of specific caliber mark on their receivers.

five.five-six
08-17-2011, 9:23 PM
not legal in california

deez
08-17-2011, 9:30 PM
Yes. You can use that 6.8 lower. No difference between and 6.8 marked lower and 5.56 marked lower other than it's markings.

/\ This.

In fact, I have a Stag 6.8-marked lower with a 5.56 upper.

CSI304
08-17-2011, 9:38 PM
not legal in california

wrong thread? :confused:

chiburi
08-17-2011, 10:51 PM
So is the 6.8 Lower just beefier?

deez
08-17-2011, 11:04 PM
So is the 6.8 Lower just beefier?

No. Exactly the same, just marked differently.

I only bought it, because it was one of the few available in late 2005.

winxp_man
08-17-2011, 11:16 PM
Everything like mentioned by the other members is exactly the same besides the marking or engravings. The only thing (if the bolt is not cycling like it should to eject the cases) is the buffer spring. I think there called SSS buffer springs or Tubbs Flatwire CS buffer spring.

chiburi
08-18-2011, 6:48 AM
I just purchased a PRS stock for my .308, but I'm selling that rifle. Sounds like the PRS won't fit on the buffer tube of the 6.8... Time to send that back I guess...

Chib

underthegun13
08-18-2011, 8:39 AM
If the lower is a complete lower (including the mag) the mag might be for the 6.8, which wouldn't feed the .223 properly. Solution: get a new mag. The 6.8 version was designed (from what I've read) within the last 6 years by the military to carry the beefier 6.8 mm SPC II round on a AR15 platform. That being said, lowers should be identical without the mag.

DannyInSoCal
08-18-2011, 8:50 AM
wrong thread? :confused:

He's not confused. 55-6 is just an idiot. 99% of what he posts is FUD.

Bhobbs
08-18-2011, 9:33 AM
He's not confused. 55-6 is just an idiot. 99% of what he posts is FUD.

I remember reading on here that you cannot use an upper chambered for one round on a lower marked for a different round. That's why they use multi cal markings now.

I don't know who posted it or if it is true.

MrPlink
08-18-2011, 9:55 AM
^ b.s.
That would make shooting .223 through a 556 upper illegal

Bhobbs
08-18-2011, 9:56 AM
^ b.s.
That would make shooting .223 through a 556 upper illegal

No, because the upper isn't controlled.

MrPlink
08-18-2011, 10:02 AM
I meant if the lower was marked 556, this also implies drop iin .22lr coversions are illegal

richie3888
08-18-2011, 10:06 AM
It's legal. Trust me.

chiburi
08-18-2011, 10:20 AM
Is that the reason for conversion kits?

Jpach
08-18-2011, 1:23 PM
I remember reading on here that you cannot use an upper chambered for one round on a lower marked for a different round. That's why they use multi cal markings now.

I don't know who posted it or if it is true.

It's not true. Anyone who posted that either had no clue what they were talking about, or thought it was a stupid question so they just said it to be a dick.


PS

I'm pretty sure that Five Five Six is just ****ing around doesn't really believe that putting a 556 upper on a 6.8 lower is illegal.

winxp_man
08-18-2011, 1:44 PM
If the lower is a complete lower (including the mag) the mag might be for the 6.8, which wouldn't feed the .223 properly. Solution: get a new mag. The 6.8 version was designed (from what I've read) within the last 6 years by the military to carry the beefier 6.8 mm SPC II round on a AR15 platform. That being said, lowers should be identical without the mag.


Not to be a DICK :D but the 6.8 SPC II does not change the ammo size. Its the chamber that is made to shoot hotter rounds. So when you say 6.8 SPC II that is what the chamber is called. Just like the original 6.8 SPC, and 6.8 DMR chamber. Ammo is ammo its called 6.8 SPC ammo. Again not trying to be a DICK just the right info :D

chiburi
08-18-2011, 6:04 PM
Cool. I know it's not illegal. That's why I'm starting this thread, A's I'm going to pair a 223 or 6.8 lower for the Beowulf...

Best,

Chib

CK_32
08-18-2011, 8:44 PM
Should be fine go for it