<Tr> <Td> 10 - 7 </Td> <Td> 1977 </Td> <Td> Change gas ring from yoke to cylinder for standard barrel </Td> </Tr> <Tr> <Td> 10 - 8 </Td> <Td> 1977 </Td> <Td> Change gas ring from yoke to cylinder for heavy barrel </Td> </Tr> <Tr> <Td> 10 - 9 </Td> <Td> 1988 </Td> <Td> Replace yoke retention system, radius stud package, floating hand hammer nose bushing for standard barrel </Td> </Tr> <Tr> <Td> 10 - 10 </Td> <Td> 1988 </Td> <Td> Replace yoke retention system, radius stud package, floating hand hammer nose bushing for heavy barrel </Td> </Tr>

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