It is the Carbine (short rifle) version of the AR15. AR stands for Armalite Rifle. It is a semi auto rifle.
Gun is not an acronym, and does not stand for nor abbreviate any other word.
Gun rack
Get a manual.
Type your answer here... you squeeze the buttons on each side of it and slide it off.
Impossible to answer without knowing the type of gun.
No, It is a type of gun
Machine gun Kelly
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I would find it difficult to find out what type of gun you have.
Pump
Classic Deluxe
The diameter of the bullets