Kel Tec Sub 2000 Gen 1 Green Fiber Optic Front Sight Post/Adjustment Screw Replacement Components Replace the fragile front sight post and adjustment screws in your Generation 1 Sub 2000 with precision machined hard black anodized aircraft aluminum replacements Green fiber optic insert in a 3/32" wide sight post. No gunsmiting drop in installation. Stainless steel locking hardware included. Installation instructions are included.