16558 3-9×40 BDC Waterproof/Fogproof/Shockproof Multicoated optics Precise, repeatable, 1/4 MOA reticle adjustments BDC (bullet drop compensating) reticle Nitrogen filled and O-ring sealed
16559 4-12×40 BDC Waterproof/Fogproof/Shockproof Multicoated optics Precise, repeatable, 1/4 MOA reticle adjustments BDC (bullet drop compensating) reticle Nitrogen filled and O-ring sealed