Bullet travel through a gun barrel is characterized by increasing acceleration as the expanding gases push on it, but decreasing pressure in the barrel as the gas expands. The last of these factors is a function of barrel length. Therefore, the energy transmitted to the bullet (with a given mass) will depend upon mass times force times the time interval over which the force is applied. The area here is the base of the bullet (equivalent to diameter of barrel) and is a constant. The controlled expansion of gases from burning gunpowder generates pressure (force/area). It is difficult in practice to measure the forces within a gun barrel, but the one easily measured parameter is the velocity with which the bullet exits the barrel (muzzle velocity) and this measurement will be used in examples below. Higher pressures require a bigger gun with more recoil that is slower to load and generates more heat that produces more wear on the metal. More powder can also be used in rifle cartridges because the bullet chambers can be designed to withstand greater pressures (50,000 to 70,000 for rifles psi vs.

(Fackler, 1996) Internal, or initial ballistics (within the gun)Д«ullets fired from a rifle will have more energy than similar bullets fired from a handgun. The wounding potential of projectiles is a complex matter. The flight path of a bullet includes: travel down the barrel, path through the air, and path through a target. A Tommy Gun of level 2 with a correct 50 round drum can be bought, and is referred to as the 'Modified Tommy Gun'.The term ballistics refers to the science of the travel of a projectile in flight. It inaccurately carries only 25 rounds in the ridiculous little drum magazine (while in reality it would be a stick). It will load from drum magazines (something that the M1A1 Thompson can't actually do, due to its magazine well design), while the handguard is replaced with the foregrip normally found on the 1921/1928 Thompson variants. The anachronistic M1A1 Thompson is called inside the game only by its nickname, 'Tommy Gun'. The name is odd, as the term 'Lupara' is normally slang for a sawn-off SXS shotgun like the one above. It is also available on Xbox Live as downloadable content.

This fictional weapon is similar to 'Street Sweeper', but has a two barrels. If you are a member of the Playstation store, you can buy an add on content that gives you an automatic shotgun that you can pick up from a merchant in the game. Note the weapon selection menu, with all 3rd level guns. The player character holds a 'Street Sweeper'. A more realistic choice would have been the 1st Gen or an early 2nd Gen model. Detective Special is anachronistic, because production didn't start until 1973, while The Godfather takes place from 1945-1955, well too early for a 3rd Gen model. An enhanced Level 4 version of this revolver, called the 'Black Widow' can only be accessed with DLC. The Level 3 variant is called the 'Saturday Night Special', and has gold plating and an ivory handle (this is odd, as normally the term 'Saturday Night Special' refers to a small, inexpensive handgun). The Level 2 revolver is a variant of the Level 1 one, and is called the '38 Special'. Called just the 'Snubnose' in the game, the Colt Detective Special is the most silent and the weakest of the handguns in the game.

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