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A shorter barrel will reduce some muzzle velocity.

A paintball pellet may have a muzzle velocity of about 300 feet per second, about one third that of many pistols.

The weapons’ rapid rate of fire and high muzzle velocity allow the shooter to fire dozens of gunshots without needing to reload.

By comparison, a .50-caliber round fired from a sniper rifle has a muzzle velocity of less than 900 meters a second.

Gabor has proposed a more realistic definition of assault weapons that takes an objective, scientific approach based on lethality - as well as relevant factors like caliber, muzzle velocity, rate of fire, capacity and design flexibility.