Welcome to the forum, Ed,
A new sear spring might just do it. Sounds as if the lug on the firing pin fails to catch on the sear as the toggle train returns to battery unless the safety is applied.
A worse case would be if the corners/angles of the lug and sear need fixin'.
__________________
"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
|