Single trigger made from double trigger?

[DoubleOframe]

Without a picture its difficult to say whose conversion or trigger it is. Is there a selector anywhere? Miller and Infallible conversions were usually marked. It could be a Novotny patent or any number of other uncommon conversions that butchered the sears and other internal parts to work with the factory trigger.

You can usually rest easy with an unaltered Parker factory single trigger as they are typically quite reliable. The same could be said for unaltered Miller conversions. Others exist but they aren't always the most reliable or simple designs.