There are two versions of the Pacific sight—a target model and a hunting model. Neither require any wood removal, only the removal of the cut-off. The target version is a little bulkier and is adjusted via knobs. The hunting version has the exact same "frame" but is adjusted to zero via screws. The hunting sight is thus just a stripped-down model.

I've a Pacific rear sight on a 24" barreled Krag with a 1905 type front sight as used on a 1903 Springfield. It's about the same height as most Krag front sights so it seems that inverting the peep would be an unusual modification. Maybe the guy that did that modification is the same fellow that keeps reinstalling original barrel mounted Krag rear sights backwards.