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Various reticle options allow you to fine-tune the optic for any platform and any application. Each reticle offers three different brightness settings. There are two buttons on either side of the housing: pressing the left-side button allows you to control brightness settings while the right-side button scrolls through the four different reticles. Reticle options include 3 MOA dot, 11 MOA dot, 11 MOA dot and circle, and a 3 MOA dot and circle. Traditionally, red-dot optics offer a fixed reticle, but the FastFire 4 allows shooters to toggle between four separate reticles to choose the one that best fits their needs. The FastFire 4 also comes with a screw-on weather shield that, when mounted, fully encloses the sight and protects it against the elements. The viewing window measures 1.1 inches by 0.75 inches, considerably bigger than the FastFire 3 at 0.8 inch x 0.6 inch window. The new aluminum housing also incorporates a larger viewing window. This new design helps disperse impact, so even if you strike the optic there’s no chance you’ll damage the optic. There’s an extension overtop of the lens to prevent damage and the top of the sight window housing is flatter than the FastFire 3. As with previous FastFire models, the FastFire 4’s housing features hardcoat anodizing and a non-glare finish, but the housing incorporates all new geometry. 45 ACP and 10mm Auto is challenging, but Burris manages to accomplish this with the FastFire 4 by securing all the internal parts within a durable machined-aluminum housing. Producing optics that are easily concealed yet capable of taking the abuse of hard-hitting handguns like. The latest addition to the Burris FastFire family, the FastFire 4, offers everything you love about previous models with some significant performance and feature upgrades, and that makes these optics not only an excellent choice for serious handgunners. Many top shooters choose Burris FastFire red-dot sights for their firearms because FastFire optics have earned a solid reputation for reliable, consistent performance. The reflex sight market is red hot right now, and virtually every handgun manufacturer offers at least one optics-ready firearm in their lineup.