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Two Types of Iron Sights for Better Accuracy Optics in firearms can offer you different benefits such as extended range, low-light visibility and also on the ease of target acquisition. Even the military has switched to optics to be used in combat situations. It is very important though that you remember that these high tech replacements for dependable old iron sights can be disabled in a particular way. If there’s no proper backup, damaged optics could make the weapon useless for an accurate shooting. The BUIS or Back Up Iron Sight can in fact give you critical redundancy in the process of setting up your AR. It could add weight, but could give you the ability in getting targets even after the primary sight goes down. Below are some of the things to which you should consider in choosing a backup iron sight.
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Iron sights are available in various configurations based with the height of the sights. The basic to this is that you need to have both rear and front sights to have the same height when you want to really hit the target.
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Where this comes into important is to where you mount the front sight. Most of these backup iron sights are actually available in 2 options to which would be the gas block height and also the same-plane height. In a gas block BUIS configuration, the front sight post is about 1/4 ” higher than the rear sight aperture so that it could make up for the case to where the front sight is mounted 1/4 ” lower than its upper receiver where the rear sight is mounted. It’s essential to remember that the gas block sights are only for the purpose of mounting on a gas block that’s usually lower than the upper receiver. Some gas blocks comes with the same height as that of the receiver where you would want the same-plane sight. The same-plane sights are made for the front sight post will be on the same height as the rear aperture if the sights are going to be placed on a flat surface. This actually means that for these sights, the front sight should be mounted somewhere with the same height as its upper receiver. In most cases, people will mount the front sight on a free float handguard with a rail present on top. Your overall AR-15 setup will be the one to help you determine if you need the folding or fixed BUIS. The fixed iron sights comes with the advantage of having no moving parts, which actually makes this nearly indestructible. Also, it’s always ready and there’s no need for you to mess with it. When you are however not using them as the main targeting system, the fixed sights would be the best choice, but for backup purposes, it’s the folding type that’s best.