Primary Arms 4-16X Sun Shade for The PA4-16X Scope - Easy Installation, Prevents Glare, Protects from Rain PA4-16SS SUN SHADE: Use the Primary Arms PA4-16SS sun shade to prevent glare and keep water away from the objective lens in the rain. EASY INSTALLATION: No tools needed! Simply screw the sun shade into the objective bell. COMPATIBLITY: This sun shade is designed for and ONLY compatible with the Primary Arms PA4-16X scope. 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.