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Two Options for Iron Sights Having optics installed in your firearm can give you various benefits like low-light visibility, extended range and having ease of target acquisition. Even the military today now switched to optics to use for combat situations. It is really important to remember that such high tech replacements for dependable old iron sights can be disabled on a certain way. If there’s no proper backup, damaged optics could make the weapon useless for an accurate shooting. A BUIS or Back Up Iron Sight can actually give you critical redundancy in setting up your AR. It could add weight, but could give you the ability in getting targets even after the primary sight goes down. What you will learn below are some things to consider in the selection for 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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This comes to play with where you are mounting your front sight. Most of the backup iron sight are available in 2 varieties, which are the gas block height and the same-plane height. On the 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 reason that the front sight is mounted 1/4 ” lower compared to the upper receiver to where the rear sight is being 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 means that for these sights, the front sight should be mounted somewhere at 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. The overall AR-15 setup will help determine if you need the fixed or folding BUIS. The fixed iron sights comes with the advantage of having no moving parts, which actually makes this nearly indestructible. It is also always ready where 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.