Bill, Yes, it is an original type 1 lock bar on SA 613217 D 28291-17 C14 B
barrel is S-A 6-42 D35448-16-R-75A, bolt is rev 12SA RE5B (hole in right lug), op rod rev 3 uncut, early gas cylinder lock screwAttachment 60064
follower 8, op rod catch without lip, follower rod short fork, stock short channel with faint
SA GHS cartouche