Two Different Options for 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. Without proper backup, damaged optics could render the weapon useless for accurate shooting. The BUIS or Back Up Iron Sight can in fact give you critical redundancy in the process of setting up your AR. This may add some weight, but this can give you the ability to get targets even when 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 should have the rear and front sight to have the same height if 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 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 of the gas blocks are of the same height as the receiver to where you 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. Typically, people are going to mount the front sight on a free float handguard with a rail present on top. The overall AR-15 setup is going to help determine whether you will 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. Another thing is that it is always ready and there’s no need to mess with them. It is however best that you get the fixed sights when you are not using them as the main targeting system, but for backup purposes, the folding is mostly being preferred.