The TRAK-LOCKA(R) II Tactical Sight is the #1 choice of Law Enforcement worldwide! The TRAK-LOCKA(R) II gives you high speed sight acquisition and improved accuracy. This rugged sight set is fully CNC machined from bar stock steel and features a tritium insert in the front sight for low light use. Both elevation and windage are quickly and easily adjusted with a single hex head screw. Easy to install, complete instructions included. High Speed Sight Acquisition and Improved Accuracy Fully CNC Machined from Bar Stock Steel Elevation and Windage are Quickly and Easily Adjusted with a Single Hex Head Screw US Patent #5210953 Fits most 12 Gauge Remington 870, Mfg: Jentra