A quick video on how to change optics on a AR-15 rifle using the picatinny rail system. This will not be the same for every optic but it will give you the basic idea of how to do it.
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Can this be placed farther forward in order to use iron sights?
What scope mounts did you use
Why the scope over the red dot sight?
Do you like the Nikon scope? Does it really have that good of clarity?