The Sure loc Challenger 550 sight is very popular because it is sturdy well made and most of all reliable all at a good price.
One touch no lock down design.
Challenger 550 Features:
- Dependable vertical locking mechanism
- 550: 5.5" frame (offers 1 1/2" more vertical adjustment than 400)
- Lightweight, extremely durable construction
- Cam-Assist 3-Axis leveling block
- Patented Split-Block design for easy scope/pin attachment swapping
- Micro-adjustments in precise and repeatable .002" increments