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Today we have Part 2 of machine gun terminology - the small caliber guns. Specifically, submachine guns, personal defense weapons, and machine pistols.

Submachine Gun: Pistol caliber, fully automatic, and fitted with a shoulder stock. For example, Thompson, MP40, MAS-38.

Machine pistol: Handgun form factor and fully automatic. For example, Glock 18, Mauser Schnellfeuer, Stechkin.

Automatic Rifle: Shoulder or hip fired, limited magazine capacity, minimal sustained fire capacity. Examples: M1918 BAR, Chauchat.

Persinal Defense Weapon: (1) Armor-piercing or (2) holsterable submachine gun, not intended for front line combat. For example, FN P90, H&K MP7, Czech vz.61 Skorpion, Polish PM63 Rak.

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