Comparing apples to apples using coset, accuracy, and features, the Challenger is second to only one in the industry...that is the Sure-Loc Supreme! The lightweight Challenger features a dependable vertical locking mechanism that is easy to use. Simply unlock the knob about 1/4 to 1/2 turn for true micro-adjustments of .002 inches or 2 1/2 turns to depress the knob and make rapid elevation adjustments. Windage adjustments are also a true .002 inches. The Challenger sights are compatible with all Sure-Loc accessories.