Just some information on Ruger barrels, CRF, LC6 trigger. Information from the "Reference of Ruger Firearms, Volume Two".

Douglas barrels to about 1973 - 74. There is not a definitive SN as the barrels were mixed during the transition period.

Wilson barrels 1973 -74 to about 1990 - 91.

Ruger in house barrels started at about 1990 SN 780-27XXX to date.

CRF 781 prefix 1992 - 93.

LC6 trigger was transitioned into M77 MKII within the SN range of 791-24657 ( with an LC6 trigger) and 791-71766 ( without an LC6 trigger).

Just passing on the info.

Last edited by 308ld; 09/09/21.

Ed