If I buy an upper for my .223 AR 15 that is 6.5 Grendel, will I have to change the buffer and spring? If so, to what.
this would be with a 20 inch barrel.
like this one
https://palmettostatearmory.com/cata...r-with-bcg-ch/
this would be with a 20 inch barrel.
like this one
https://palmettostatearmory.com/cata...r-with-bcg-ch/

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