I don't have a RAR 308-family mag to try, but...
Can the 308 mag be modified to use longer 223 cartridges, or can the 308 end piece be used on the 223 front?
Nope, got a 243 mag...
maybe if you single shot it...which I do alot... but its not an easy fix...
I do have one of the Cotis Mags...
had two, loaned one to a forum member in Montana to try out...
haven't heard from him since... so guess that one walked away...
kinda disappointing..