Paintball marker

Marker body

A player using a Spyder paintball marker.
The marker body is where most of the marker's functional and aesthetic features are contained. Most marker bodies are constructed from aluminum to reduce the marker's weight, and feature custom milling and color anodizing. In terms of function, the body contains the main components of the firing mechanism: the trigger frame, bolt, and valve.

External design
The largest external and ergonomic difference in marker bodies is trigger and barrel position. High-end marker designers work to push the trigger frame forward toward the center, or slightly forward of center of the body on speedball-oriented markers. This allows the HPA tank to be mounted in a position that provides compactness and balance without requiring any additional modifications that drop the tank down and forward. (Such aftermarket "drop forwards," may create a larger gun profile, which can result in eliminations due to hopper hits.) In economy markers, users often modify the marker to produce the same feel, albeit by sacrificing a low profile. Though this is an irrelevant consideration in games where equipment hits do not count, a majority of fields, including those focused on woodsball games, count hopper hits as an elimination. However, some markers mount the barrel farther back in the gun body to preserve overall compactness in lieu of positioning the trigger forward on the marker body.

Trigger frame
Triggers are one of the most important functional features, as they are the the player's primary means of interaction with the marker. The amount of force required to fire the marker, as well as the distance the trigger travels before actuating (the "throw") has a major effect on the player's ability to achieve high rates of fire. Higher-end markers employ electronic trigger frames with a variety of sensing methods (microswitches, hall effect sensors, or break-beam infra-red switches). These triggers feature very short throws, which allows for higher rates of fire. Non-electronic markers may alternatively use carefully set pneumatics to achieve a light and short trigger pull.
The trigger frame on non-electronic mechanical markers simply use a series of springs and levers to drop a sear, which allows the hammer in the body to propel forward. On electronic markers, the trigger frame houses the electronics that control the solenoid, as well as other features on the marker such as ball detection systems. Upgraded circuit boards are available to improve various features in the marker.

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