Your genetics and personal experiences will help guide your choice. User preference when it comes to firearms is individualistic by nature and doesn’t care what color the eye picks up the fastest. Of course there is always user preference. There isn’t the same washout effect with orange sights. When utilizing white rear sights this system allows the user to aim with precision or speed due to the contrasting colors. It’s also less reflective and easier to focus on. However, it’s still extremely fast, much better than just a tritium vial. Orange is a high visibility color that is slightly below yellow and green on the eyes ability to pick it up. Consequently, combining a yellow front sight with black rings in the rear sight and have become one of Night Fision’s top sellers. Further, a lot of shooters will also experience wash out when mixing yellow with white rear rings. In super bright situations it can strain the eye for extended periods of shooting. The only downside to yellow is its somewhat reflective nature. In fact, the eye picks up on yellow almost as fast as it picks up on green. Yellow is a lot like green, the human eye picks it up very quickly. The majority of our customers agree this is the best performing color of the three in most lighting conditions. Not so much in nature, but in the world around you, especially in urban environments. White is a common color in our living world. In situations that are moving fast the white front may get lost in a world of white. The biggest downside to using white front sights comes in situations where fractions of a second are on the line. You can see the sight quite quickly and as a passive color it’s very easy to focus on. White is often very easy to see in both bright and low light situations. Night Fision utilizes three different front sight colors for daylight shooting: White, Yellow, and Orange This gives you an easy to see and fast to pick up daylight option for combat and sport shooting. For example, Night Fision sights use a fluorescent additive in our ballistic polymer ring around the tritium. If you’ve bought a high quality set of iron sights then you have a daylight option too. If you’ve gone with some less than stellar night sights you don’t really have options. You can’t quite see the glowing front and rear sight when the lights come on. As concealed carriers we need to be ready 24/7. Now what happens when the sun rises or the light switch is flipped, or maybe you turn your weapon light on. That’s great in when it comes to low light shooting and honestly it’s perfect. Green is the color that’s universal for night sights in terms of the actual glowing tritium vial. Therein lies both a solution and a problem. In general, most human eyes pick up one color faster than any other, and that color is green. Handgun sights are an extremely personal choice since every person sees the world in a different way. A front sight with high visibility will make front sight focus more than a concept. Your front sight should be easy to see, and easy to focus on. Is it easy in practice? It can be, with the right sights. Front sight focus is an easy concept to understand. Just take your time.Front Sight Focus! If you ever take a defensive pistol glass you’ll hear that phrase over and over. You need to watch that you don't cover the gas port and thus have the block rotated correctly. Tools required: Front site tool, taper reamer, drill soft hammer, block of wood or something capable of uniformly knocking the FSB into place. The F-marked FSB are for A3/A4 uppers where you're installing some flip-up or similar peep sights. The 'Non-F-marked' are for uppers with built-in carry handles.All AR-15/M16 barrels with a 0.750" or 0.625" gas tube section of the barrel (especially those with taper pin holes).Available for 0.625 or 0.75" diameter gas block'd barrels.Sometimes called the FSB (Front Sight Block/Base).We offer an F-marked, 0.75" version that has the sling swivel pre-installed (swivel not shown in photos). This translates to a difference of only 6 clicks assuming you're using the common 4-notch front sight post so it might not matter if you have enough adjustment room on your Front Sight Post. Non-F-marked Front Sight Blocks (sometimes called the Standard or A2 version) are intended for the classic A2 carry handle receivers. The difference between F-marked and non-F-marked is a very small difference in height, the 'deck' on the F-marked FSB is 0.04" taller, intended for Flat-top upper receivers. She's pretty fresh and will need you or your smith to drill and ream the taper holes for installation. This is your standard A1 or A2 height Front Sight Block/Base (FSB). This brings back memories don't it? Ah the good old days when AR's were simple and not quite the lego that they are today.