The Trijicon ACOG Thumb Screw Assembly (RCO) AC12007 is a high-quality accessory designed for easy and secure attachment of your ACOG scope. Made from stainless steel, this thumb screw assembly ensures durability and a firm grip. The slotted head design allows for quick adjustments without the need for additional tools. Compatible with RCO models, this thumb screw assembly is an essential component for maintaining the stability and accuracy of your ACOG scope. Trijicon ACOG Thumb Screw Assembly (RCO) AC12007