5.56 upper to 6.8/224 Valkyrie?

chiefr · October 20, 2019, 03:19 PM

I bought a 224 Valkyrie barrel and would like to build an upper. I have a complete built upper ready but it for a 5.56. Can I use the 5.56 upper for my build? I know the bolts are different between the 6.8/224 and the 5.56, Thanks

rickyrick · October 20, 2019, 04:06 PM

I put a 6.8 barrel on a regular AR15 upper no problem

MTT TL · October 20, 2019, 04:25 PM

The 6.8 uses a different magazine, not sure about the 224. I bought a 6.8 complete upper and slapped it on a 5.56 lower and it runs flawlessly.

reynolds357 · October 20, 2019, 07:05 PM

Quote:

Originally Posted by chiefr

I bought a 224 Valkyrie barrel and would like to build an upper. I have a complete built upper ready but it for a 5.56. Can I use the 5.56 upper for my build? I know the bolts are different between the 6.8/224 and the 5.56, Thanks

Yep. Bolt face and mag are different.

bfoosh006 · October 23, 2019, 07:10 PM

Yes a .224V and or 6.8 barrel could use the same upper.
As mentioned.. you will need a different bolt, and mag.

However.... a stripped upper or complete upper is so cheap, I wouldn't even bother to swap it out.
I'd buy a spare upper. That way you have both "completed" uppers readily available to you.
Seriously, AR15 uppers can be bought for diddly squat.

The Big Game Hunter · December 29, 2019, 09:45 AM

Quote:

Originally Posted by chiefr

I bought a 224 Valkyrie barrel and would like to build an upper. I have a complete built upper ready but it for a 5.56. Can I use the 5.56 upper for my build? I know the bolts are different between the 6.8/224 and the 5.56, Thanks

The 224 Valkyrie and 6.8 SPC use a case with a .422" rim diameter while the 5.56/223 uses a .378" rim diameter. So, you'll need a new bolt and magazine (the 224 Valkyrie will work with a 6.8 mag).
More information here: https://thebiggamehuntingblog.com/224-valkyrie/

October 20, 2019, 03:19 PM	#1
chiefr Senior Member Join Date: January 27, 2010 Location: AR Posts: 1,401	5.56 upper to 6.8/224 Valkyrie? I bought a 224 Valkyrie barrel and would like to build an upper. I have a complete built upper ready but it for a 5.56. Can I use the 5.56 upper for my build? I know the bolts are different between the 6.8/224 and the 5.56, Thanks

October 20, 2019, 04:25 PM	#3
MTT TL Senior Member Join Date: October 21, 2009 Location: Quadling Country Posts: 2,670	The 6.8 uses a different magazine, not sure about the 224. I bought a 6.8 complete upper and slapped it on a 5.56 lower and it runs flawlessly. __________________ Thus a man should endeavor to reach this high place of courage with all his heart, and, so trying, never be backward in war.

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October 20, 2019, 04:06 PM	#2
rickyrick Senior Member Join Date: March 15, 2010 Posts: 7,442	I put a 6.8 barrel on a regular AR15 upper no problem

October 23, 2019, 07:10 PM	#5
bfoosh006 Senior Member Join Date: February 17, 2009 Posts: 997	Yes a .224V and or 6.8 barrel could use the same upper. As mentioned.. you will need a different bolt, and mag. However.... a stripped upper or complete upper is so cheap, I wouldn't even bother to swap it out. I'd buy a spare upper. That way you have both "completed" uppers readily available to you. Seriously, AR15 uppers can be bought for diddly squat.