The Trijicon ACOG External Adjuster Caps & Lanyard AC10004 is a replacement set designed for ACOG scopes with external adjusters. This set includes two adjuster caps and a lanyard, ensuring secure attachment and easy adjustments. Made from durable materials, these caps provide long-lasting performance and protection for your scope's adjustment mechanisms. Trijicon ACOG External Adjuster Caps & Lanyard AC10004