Lyman 17AMI Front Target Sight .494 High 3/8" Dovetail

17A Target Sights from Lyman are machined from a solid piece of steel and are designed to be mounted in 3/8"dovetail slots (except 17AEU which has a .360" metric size dovetail). They are supplied with eight interchangeable inserts (see photo and description) that are locked in place with a threaded cap.