Non adjustable blade sight.
Iron sights are the most common an are sometimes interchangeable.
Rear notch, front blade.
Handguns are the most prevalent firearm used in homicides.
Depends on the firearm, and the laws where you are. We can't begin to give you a real answer without more info. In MOST of the US, there IS no registration of ordinary rifles, shotguns, and handguns.
Iron sights are the most inexpensive type of firearm sight. They consist of a front post and a rear notch or aperture, allowing for quick target acquisition without the need for batteries or complex adjustments. Due to their simplicity and durability, they are commonly found on a wide range of firearms, from handguns to rifles. While they lack the precision of more advanced optics, they are effective for many shooting scenarios.
handgun
Depends on the gun. For most common rifle, shotgun, and handguns, MD does not have a registration requirement. Assualt weapons are required to be registered. Link below to MD firearm laws, and you can check with the MD State Police.
revolver
the most common robot sense
sight words are the most common words in the English language
the comon eye sight for humans is the pupil
.22 Long Rifle