[nsxwolf]

Not sure what you mean by "military-grade" rifles, but sub-machine guns and automatic rifles are basically unobtanium to ordinary citizens. They are heavily regulated and restricted to pre-1986 firearms, making them astronomically expensive.

[HoHoHoNowIHaveA]

A weapon which has it's primary application in the rapid suppression and/or killing of human beings not game or target shooting.

A weapon suited to military maneuvers of a fire team, platoon or larger formation attack.[1]

A weapon which falls outside the boundaries of reasonable use for home protection and includes modified components or additional lethality, magazine capacity or militarised amendments.[2]

[1] Military personnel are highly unlikely to conduct offensive action utilising sidearms. Sidearms are considered a defensive weapon system.

In addition, ammunition greater than the calibre 5.56mm is designed to kill human beings whilst 5.56 mm ammunition and below is designed to injure and maim but ultimately limit loss of life. Injury of military opponents on the battlefield is a greater asset than destruction.

[2] Home deterrence is as equally likely to be achieved whilst brandishing a single shot hunting rifle, sidearm or shotgun.