I have a very late rear position factory single trigger, probably in the final year of Syracuse Lefever production before the sale to Ithaca. The single trigger works very well. The last catalogue produced by the Syracuse Lefever company devotes 3 pages to the single trigger. Giving it that much play in the catalogue suggests that they were confident that they had gotten the kinks out of it at that point. Mine is an E grade with Krupp barrels and,like Ron's, has a clamshell release. Rich

Rich