Also, for what it is worth, the rear elevation wheel on an M16A4 is worth 1/2 minute, the windage is worth 1/2 minute, and a click on the front post is worth 1.2 minutes. This means to sight in the M16A4 at 25 meters requires the operator to click up the BDC 2 clicks from initial 6/3, to have a good 300 zero when the BDC is clicked back down to the 6/3 setting. On another note, since the 20 inch barreled rifle actually produces a higher velocity than the carbine, its bullet path will intersect line of sight at 32 and 300 meters, unlike the bullet path from the M4, which produces a bullet path intersecting line of sight at 25 and 300 meters. In other words, the front sight will be loose.
F MARKED FRONT SIGHT FULL
Adjusting the front post counter clockwise to lower grouping necessary for a 300 meter BSZ with BDC function intact usually requires two full revs of the front sight, which sets it outside of mil-spec. Usually, with the BDC indexed at its bottom, to properly process a 300 meter BSZ, either rifle or carbine would shoot about 10 minutes high with the front post's flange flush with the FSB deck. If you fit an A2 FSB to a rifle or carbine fitted with the detachable carry handle BDC, the gun will be difficult to zero. It is designed for use with the detachable BDC carry handle sight, whether on an M4 or M16A4, which is about forty thousands higher than the A2 fixed carry handle BDC. It is Night Fision’s mission to ensure you have an option that is perfect for you.The 'F' marked FSB is about forty thousandths higher than an A2 FSB. 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. Front Sight Focus! If you ever take a defensive pistol glass you’ll hear that phrase over and over.