Primary Arms Anti-Reflection Device Our 3X Prism Scope Only - PA3XKF USE: Add this small, lightweight device to eliminate excess glare and hide any glint. COMPATIBILITY: Compatible with Primary Arms 3X Prism scopes, models PAC3X-ACSS-5.56 and PAC3XAK300BO only. DURABLE AND LIGHTWEIGHT: Constructed of lightweight aluminum with a hard-coat anodized finish. 1-YEAR WARRANTY: If a defect due to materials, workmanship, or normal wear and tear has caused your product to malfunction, Primary Arms will either repair or replace.