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Two Different Options for Iron Sights for Better Accuracy 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 has switched to optics to be used in 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. 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. 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 actually available in different configurations based on 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 into importance on where you are mounting your 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. 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 of the gas blocks have the same height with that of the receiver to where you want the same-plane sight is. The same-plane sights are made so that the front sight post is on the same height as the rear aperture when the sights are being put 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. Usually, people will mount the front sight on a free float handguard with the rail 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 have the advantage to where it comes with no moving parts, which gives the advantage to where it makes it nearly indestructible. It is also always ready where there’s no need for you to mess with it. If you are ever not using them as your main targeting system, you should consider using the fixed sights, but for backup purposes, the folding types are the ones that’s best.