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Old October 20, 2019, 03:19 PM   #1
chiefr
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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
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Old October 20, 2019, 04:06 PM   #2
rickyrick
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I put a 6.8 barrel on a regular AR15 upper no problem
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Old October 20, 2019, 04:25 PM   #3
MTT TL
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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.
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Old October 20, 2019, 07:05 PM   #4
reynolds357
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Quote:
Originally Posted by chiefr View Post
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.
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Old October 23, 2019, 07:10 PM   #5
bfoosh006
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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.
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Old December 29, 2019, 09:45 AM   #6
The Big Game Hunter
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Quote:
Originally Posted by chiefr View Post
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/
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