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Old December 29, 2019, 09:45 AM   #6
The Big Game Hunter
Join Date: November 26, 2012
Posts: 34
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).
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