Gives the single-shot or lever gun shooter the period looks of a traditional, tang-mounted peep sight plus new adjustability features that allow fast changes from short- to long-range settings. Great for the cowboy shooter who wants to use the same gun in cowboy competition and long-range side matches, or as an alternative to vernier-type sights on single-shot rifles used in BPCR and other long-range competitions. Each sight comes with a post that is the correct height to regulate the same as the original factory iron sights. Click adjustable for windage and elevation; each click is approximately A 1/4" of adjustment at 100 yards. For larger elevation changes, you can easily swap Mfg: Marble Arms SPECS: Steel, blued. Drilling and tapping may be required for installation on older guns. Sight kit includes base, Low (L) or Standard (S) height post, A 1/2" O.D. aperture disc with .055" peep, and Allen wrench.