USED Kensight Glock Large Frame Adjustable Square Blade Rear Sight Black. In addition the proprietary fixed sight dovetail placed at the very rear of the slide is small shallow and not generally seen as ideal for an adjustable sight. Knowing this Kensight has designed this front and rear sight set specifically for the FULL SIZE LARGE FRAME Glock pistols. This fully adjustable rear Kensight Item# 860-821 utilizes the small shallow factory dovetail so no sight or slide cutting is required. It is precise and practical well-built and able to withstand a lifetime of use. Because it is a fairly tall sight that sits completely on top of the side a front sight with a minimum height of .315is absolutely necessary. This is why Kensight had beveled the rear blade to prevent snagging and to protect the shooters hands. The rear sight is fully adjustable for windage and elevation. With positive clicks a simple turn of the screw will let you dial it in to shoot at any reasonable distance. Not only is the sight highly effective and easy to use it looks good too Knowledgeable shooters will note that our rear sight blade does not extend past the rear of the slide like many other adjustables that can extend 1/4" past the slide putting your hands and clothes at risk. Specifications for Kensight Glock Large Frame Adjustable Square Blade Rear Sight: Manufacturer: Kensight Gun Make: Glock Gun Model: Glock 21 Glock 20 Color: Black Fabric/Material: 4140 Chrome Moly Steel Gun Type: Pistol Mount Type: Dovetail Package Contents: Kensight Glock Large Frame Adjustable Square Blade Rear Sight What firearm models does the manufacturer say Kensight Glock Large Frame Adjustable Square Blade Rear Sight is compatible with? The manufacturer suggests that Kensight Glock Large Frame Adjustable Square Blade Rear Sight is compatible with Glock 20 Glock 21Kensight 860-821: Glock Large Frame Adjustable Square Blade Rear Sight Black