This sight set uses the Heinie Classic rear design. It is the original rear design produced by Heinie. This sight set is equipped with the legendary Straight Eight night sight system. One single tritium insert in the rear (for low-light and nightime shooting) that aligns vertically with the single tritium front insert (when used as a set). This vertical alignment is proven to be faster and less confusing for the human eye.
Machining of the slide is required for installation. Heinie recommends using a competent pistolsmith for installation. HSP offers installation, turn around time is currently running about 1-2 weeks.
Blued finish, rust preventative is recommended.