Trijicon ACOG Internal Adjuster Caps and Lanyard. Trijicon ACOG Internal Adjuster Caps and Landyard TA71 set for the ACOG Rifle Scopes by Trijicon is designed to fit those Trijicon ACOG scopes's that have an "internal" adjuster. This adjuster has a low profile and sits inside a brass setting. The dial is silver in color and is adjusted with the use of a tool. Trijicon ACOG External Adjuster Caps and Landyard TA71E set for the Trijicon ACOG Scopes is designed to fit those ACOG's that have an "external" adjuster. This adjuster has a higher profile than the "internal" adjuster. The dial is black in color and is adjusted by finger touch. We offer complete line of Trijicon Scopes Accessories. For more Rifle scope Accessories please visit our Rifle Scope Accessory page. Our store offers a full line of original Rifle Scope Accessories by Trijicon with full manufacturer's warranty and Free Shipping on orders over 49 Also our store carries a wide selection of different products made by Trijicon such as Trijicon Red Dot Sights Trijicon Rifle scope and other. Available models of Trijicon ACOG Caps & Lanyard: TA71: Trijicon ACOG Internal Adjuster Caps & Lanyard TA71E: Trijicon External Adjuster Caps & Lanyard for ACOG Scope Specifications for Trijicon ACOG Internal (External) Adjuster Caps and Landyard TA71 and TA71E: Manufacturer: Trijicon Condition: New Package Contents: Trijicon ACOG Caps and Land yard Trijicon ACOG Internal Adjuster Caps and Lanyard TA71