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Iron sights are the most common an are sometimes interchangeable.
Sight
Rear notch, front blade.
Non adjustable blade sight.
A backsight is the rear sight of a firearm.
Depends on the firearm.
the process of lining up a firearm's rear and front sights
It is the image that a shooter sees when looking through the sights of a firearm at a target, and shows the alignment of rear sight, front sight and target.
Yes. If you don't have a CCW, it must be kept in plain sight.
bead sight
$25-$90. Inexpensive firearm of indifferent quality.
You must define what type of firearm you are talking about.