content: I would definitely recommend this over the stock sight that comes with the gun.The sight installs easily and tight into the gun. Definitely improves seeing the front sight picture, even in semi-low light conditions it's improved. Definitely an improvement at a good cost.The 'tab' sent with it for changing out the optic colors, is inserted into the side of the sight under the optic (to depress a spring) and then had to poke it out from the front end to get it to loosen, and then was able to slide it right out. Instructions are not clear at all on this.Does come with a small case to keep the different colored optics in, which is a definitely plus.