Kel Tec Sub 2000 Large Aperture Lever Actuated Folding Rear Sight Larger .170" sight aperture as compared to the .125" original sight aperture. The first and best lever actuated rear sight for Kel Tec Sub 2000. Compatible with both the Generation 1 and Generation 2 models. Simple drop in installation. Instructions included. The lever can be mounted on either the right or left side of your rifle.