Firearms Question and answers 2023

Firearms Question and answers 2023Ballistics How bullets behave after being fired from a gun internal and external Crime scene reconstruction Estimate distance between gun and victim or trajectory of bullets Firing a gun steps The hammer primer gunpowder and explosion First step of firing a gun Hammer strikes firing pin Second step Firing pin strikes primer which causes spark Third step Gunpowder is ignited causing an explosion Last step Explosion starts bullet down the barrel of gun Bullet traveling As bullet travels down guns barrel is twisted by lands and grooves of barrel Rifling A cut me down the center of the barrel of a rifle Guns are rifled Spiral grooves are cut in the inside of barrel to make bullets spin Leaves lands high parts and grooms little parts When gunbarrel is manufactured Rifling is cut restamped inside Depths of grooves with plans directions and degree of twist vary among weapons Action For every action there is an equal and opposite reaction Bullet being pushed When bullet is pushed forward the cartridge case is pushed back against the breach face rear wall of the firing chamber Removal As the eject or pushes the cartridge case out of the firearm it leaves it's mark on the side of the cartridge case these marks made by the extractor and eject it will match the marks made another cartridge cases fired by the same firearm Caliber The diameter of the fire arms barrel The caliber is measured at the base of the bullets Barrel characteristics 1. Caliber 2. Number of lands and grooves 3. Direction twist 4. With the lands and grooves