Ft Lbs of energy
Low muzzle velocity or energy
To switch from high power to low power shells, you need to manually unload the high power shells from your firearm and load the low power shells instead. Make sure you select the appropriate shells that are suitable for your firearm and intended use to ensure safe and effective shooting.
You must define what type of firearm you are talking about.
Low muzzle velocity
You need to define best for WHAT. There is no one "best".
a low powered fire arm is a .22 long rifle
Yes, a shotgun is considered a firearm even if totally dismantled because it still contains the essential components that define it as a firearm. Ownership and transportation may still be subject to firearm laws and regulations even in a dismantled state.
Can't be answered until you define what "modern rifle" means.
define down low
You need to define"firearms license". There is no license needed to own or to carry a firearm in AZ.
Low serial numbers can increase a firearm's value if they are very low, but somtimes things change during the production of firearms and higher serial numbers might be worth more. It really depends on the make and model of the firearm.
Define 'low level memory' first.