Ed, some additional data, Original Lend Lease I checked some 20 years ago s/n 471665 D 28291-14 REP 24 B barrel S-A 12-41 BNP proofs in chamber area, bolt is revision 12 RE5B could this bolt be correct ?

Incomplete data on this s/n 539967 D 28291-14 REP 24A barrel is S-A 1-42 , polished bolt and rear lugs rev 12 RE5C