Superb optical glass is precision ground. The lenses are multi-coated for glare resistance and maximum efficiency in low-light hunting conditions. The Fullfield E1 4.5-14x42mm riflescope has a sleek profile. It features upgraded windage and elevation knobs and the separated power ring and eyepiece accepts flip-up lens caps. The scope is housed in a 1-piece, stress-free tube. Its internal assembly is double spring-tensioned for shockproofing. The riflescope is resistant to a lifetime of field use, heavy recoil and harsh vibration. It is protected by the Burris Forever Warranty.