We would like you to assess the QUALITY of each of the following argument (discussing Gun Control) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gun control. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gun control.

This 20-round pistol fires a 5.7mm bullet that will defeat most body armor in military service around the world today.
Valid

As a gun-owner and/or strong 2nd Amendment advocate, its importance cannot be overstated, and I do believe it has the potential to render a slew of local, state and federal laws null and void.
Valid

Under English common law, the Castle Doctrine was intended to be a narrow exception to the general duty to retreat.

Invalid

