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Due to the high velocity of the BBs, many players opt to wear military BDUs for more than just cosmetic reasons. These thicker clothes help protect from potentially painful welts that might be caused
by the impact of a BB from a "high" (400-550 ft/s) velocity gun at shorter ranges, but may somewhat hinder one's ability to
determine if they've been hit by a "standard" (275-350 ft/s) velocity gun at longer ranges. Also, protective glasses or goggles
are a minimum requirement to play in most games and virtually all players absolutely refuse to play without proper eye protection. If one is shot in the naked eye with an airsoft gun, it will almost assuredly seriously injure their eye, and the player
runs the risk of permanently losing their vision.
For this reason, while a very few fields have less stringent requirements for eye protection, nearly all organized groups
of players, and fields that allow airsoft require that their eye protection fully seals the area around the eyes, and also
meets or exceeds ANSI's Z87.1-2003 goggle standard for eye protection (resists 3 joules of impact energy without damage). Some players will buy
paintball goggles, which are held to higher impact rating standards, ASTM's F1776. Note that Z87.1-2003 rated goggles are not intended for use in industry and manufacturing, and are not specifically
intended for use in sports.
According to ANSI publications as of June 2006, The ASTM is currently developing a more specific standard for the sport
- ASTM Z1535Z - Standard Specification for Eye Proctective Devices for Airsoft Sports.
Some other rules such as a maximum BB velocity and distance guidelines are used in different ways by groups depending of
their location. Though not required at all fields, a facial covering such as a balaclava or a paintball mask (paired up with the set of goggles) is commonly used, as there have been a few cases of players having
chipped teeth due to direct hits by airsoft pellets.
There is not yet a world wide consensus between Airsoft players regarding muzzle velocities, and different limits may apply
depending on the airsoft field. For security reasons majority will use limits far below skin penetration level assuring that
the game is as safe as possible. These limits are based on muzzle velocities measured using BB’s weighing 0.20 grams,
although BB’s of other weights are allowed for play, 0.20 as become a standard when performing measurements
Comparisons with paintball
Most people do not realize that airsoft has been around significantly longer than paintball. Paintball first came on to the scene in the United States in the mid-1980s through the use of utility companies' paint marking guns, which mark power/utility poles. Paintball has
gained greater popularity more quickly than airsoft in the United States. However, in Asia, airsoft is much more popular and paintball is nearly non-existent. It should be noted that while airsofters and paintballers
are serious about their sport, the debate between them is often not.
Many question how airsoft players know they hit their target or have been hit by an opponent. Unlike paintball, which leaves
paint on impact (depending upon shot distance and if the ball breaks), it is possible that airsofters take a hit and because
of their apparel or gear, are not able to feel the BB strike. Other methods like the audible sound of a hit or seeing a BB
bounce off are also clear tell-tale indications. But in all cases, an honor system is required to be used among players which
(when properly enforced) is known to work very well. In many cases, paintball requires the same honor system, as paintball
hits can be hard to see in the heat of battle and can be wiped off.
Kinetic energy transfer is relatively minimal in Airsoft compared to that of Paintball. A standard 0.68 caliber paintball
averages a weight of 2.84 grams. Paintball fields limit the maximum allowable muzzle velocity to be 300 feet per second in
most events. A paintball projectile weighing approximately 2.84 grams and traveling at 300 feet per second is able to transfer
approximately 11.8 Joules of energy. Although there is a considerable difference between airsoft and paintball energy levels
the type of collisions must also be considered (refer to Airsoft pellets#Pellet ballistics for more information).
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Tools and Materials
The guns used in airsoft are typically replicas of real firearms that compress air by a variety of means to fire a lightweight
plastic pellet. Airsoft guns can be loosely divided into three types based on the method used to generate the required pressure:
spring powered, electric powered, and gas-powered. Firing lightweight plastic pellets at moderate velocities, airsoft is a
fairly safe military style game when appropriate precautions are observed. The minimum safe level of personal protective gear
required to participate in most games is a pair of impact-rated goggles to protect the eyes of the participants. Even where
this requirement is not enforced, it is almost universally considered extremely foolish and needlessly dangerous to play without
this minimum level of protective gear.
Spring-powered guns are manually cocked by the user, which compresses a spring inside a piston, which will make an airtight
seal against its chamber when released. Once cocked, the piston is then held in place by a sear until released by pulling
the trigger of the replica. The trigger releases the sear, which releases the piston, which is in turn pushed back into its
original position by the action of the spring. The airtight seal of the piston against the chamber wall creates a high-pressure
area behind the pellet, projecting it down the barrel and towards the intended target. Spring guns are often the cheapest
of airsoft guns, as they have a minimum of internal parts. In competition play, the most popular form of spring guns are replicas
of various bolt-action rifles, as the manual cocking of the spring mimics the action of the bolt on a real sniper rifle. Spring
pistols must be cocked by pulling the full top portion of the gun back, while rifles usually have a lever of some sort to
pull.
Electric airsoft guns (generally known as an "AEG" for Automatic Electric Gun) are the most
commonly used type of replica found at airsoft skirmishes. The AEG gearbox utilizes the same principle as a spring gun to
propel a BB, but the cocking action is automated through the use of an electric motor (similar to those found in remote control
cars) used to drive a gearbox assembly that is capable of fully automatic fire at rates equivalent to those of the real automatic
weapons the airsoft gun is a replica of. AEGs are typically powered by rechargeable battery packs, composed of 7-8 cells similar
to those found in remote control cars.
Gas-powered guns operate by storing a pressurized gas in a liquid form (similar to storage of propane, butane, or carbon
dioxide as a pressurized liquid) inside a chamber, and releasing a small amount of the liquified gas into the firing chamber
(where it expands dramatically in volume) in order to propel the pellet, and usually (but not always) some of the gas is also
used in "blowback" operation in order to cycle the internal mechanism and reset for the next shot. Gas-powered pistol replicas
that also "blowback" the slide similar to a real pistol are typically more expensive than "non-blowback" replicas that don't
do this, due to the complexity of the blowback action. Pistols are the most common form of gas blowback guns, as the blowback
creates very realistic slide action on the gun. Early airsoft rifles were gas (typically CO2) powered as well, but nearly
all modern rifles are of the electric type.
Each of the three types of airsoft replicas has an aftermarket for upgraded internal (performance and durability) and external
(cosmetic and ergonomic) parts, and many serious players upgrade their guns with parts (which may collectively cost as much
or more than the original purchase of the gun in it's stock form) for a variety of reasons ranging from personal aesthetic
preference to increased reliability/durability to increased accuracy/performance of their airsoft replica on the field in
competition/recreation.
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Terminology
In this area I'll define any specialized vocabulary that it's helpful to know in order to perform the tasks described on this
page.
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