Question: Which things play an important role when one is handling a rifle or handgun?
About the article "Shooting", section "Competitive shooting".

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Marksmanship has inspired competition, and in several countries rifle clubs started to form in the 19th century.
Soon international shooting events evolved, including shooting at the Summer Olympics (from 1896) and World Championships (from 1897).
The International Shooting Sport Federation still administers Olympic and non-Olympic rifle, pistol, shotgun, and running target shooting competitions, although there is also a large number of national and international shooting sports controlled by unrelated organizations.
Shooting technique differs depending on factors like the type of firearm used (from a handgun to a sniper rifle; the distance to and nature of the target; the required precision; and the available time.
Breathing and position play an important role when handling a handgun or a rifle.
Some shooting sports, such as IPSC shooting, make a sport of combat style shooting.
The prone position, kneeling position, and standing position offer different amounts of support for the shooter.
An assault rifle is a selective fire rifle or carbine typically firing ammunition with muzzle energies and sizes intermediate between those of handgun and more traditional high-powered rifle ammunition.
Assault rifles are categorized between light machine guns, intended more for sustained automatic fire in a support role, and submachine guns, which fire a handgun cartridge rather than a rifle cartridge.
Assault rifles are the standard small arms in most modern armed forces, having largely replaced or supplemented larger, more powerful rifles, such as the World War II-era M1 Garand and Tokarev SVT.
Belt-fed weapons or rifles with very limited capacity fixed magazines are generally not considered assault rifles.
Semi-automatic rifles are not always classified as assault rifles as they are not fully automatic and some are not designed for military use.
However, in media firearms reporting the term "assault rifle" usually refers to visual appearance rather than internal functionality.
Similar full sized weapons, with full-auto capabilities chambered in full-sized rifle rounds, are known as Battle rifles.
Examples of Battle Rifles are the FN FAL, H&K G3 and M14 rifle.
For these type of firearms, see List of battle rifles. 
A gun shield is a flat (or sometimes curved) piece of armor designed to be mounted on a crew-served weapon such as a machine gun or artillery piece, or, more rarely, to be used with an assault rifle.
Some law enforcement units use ballistic shields with opening to shoot a handgun through, but in this case the shield is not affixed to the weapon itself, which would make a handgun very unwieldy and difficult to aim. 
The TEC-22 is a handgun chambered in .22 Long Rifle. 
In comparison to long guns (rifles and shotguns), handguns are smaller, lighter, and easier to carry.
Since firearms do not rely entirely on the user's strength, they put weaker individuals on an equal footing; when Colt produced the first practical repeating handgun, it gave rise to the saying "God created men, but Colt made them equal.
"Since using a handgun, at a minimum, requires one hand whereas long guns often require both, that leaves a handgun user with a free hand.
One example of where this is an advantage is with tactical lights, where the light and handgun can be used independently or in coordination; mounted lights, as used on long guns and submachine guns, don't allow the light to be pointed independently of the firearm.
In addition, handguns can be more easily used ambidextrously, and therefore the user can switch firing hands depending on the situation.
Another important tactical consideration is maneuverability.
In close quarters, an opponent could more easily wrestle a long gun's muzzle to a position where it is not covering him, or could more easily wrestle the gun away from its owner, whereas a handgun offers little to grab, and would be more likely to still be covering some portion of the opponent during the struggle.