The Barska 4-16x44mm Ridgeline Riflescope is field tested to meet the strictest quality standards of hardcore users. These 2nd generation Barska Ridgeline Riflescopes are built to measure up against tough performance. The Ridgeline series by Barska is newly designed with the latest optical technology, such as external locking windage and elevation adjustments. Ridgelines also feature Barska's "Accu-Lock" system which utilizes a coil spring positioned within the scope to securely lock the inner tube. This system allows the riflescope to stay locked dead-on to the target shot after shot. Serious hunters can truly count on these Barska Riflescopes to provide the brightest and sharpest image from edge-to-edge. The riflescope's 1" inch main tube features a shockproof high impact rated design to withstand repeated abuse of high caliber recoil, in the most rugged shooting conditions.