bouncing

There are two types of bounce... electrical and mechanical.

Mechanical bounce is when the recoil of the marker sets off additional shots.   It also can be caused by bumping the marker on something or any other jolt.   Usually this is cause by having a TRULY hair trigger, the trigger is set too short.

Electrical bounce is caused by the programming/settings of the marker.   Some boards actually promote the bounce to increase ROF into the insane range.   In most cases, this can be cured through setting adjustments.  

Example: the E-Blade for the Autococker has setting that when changed will make the marker wait for a period of time before it will fire again.   This value is in milliseconds... basically it waits to make sure that the trigger is actually being operated with a valid pull.

To continue further, there are some boards that induce "Ramp."   Ramp can be described as a turbo mode or accellerator.   When your trigger is pulled at "X" amount of times per second, the gun electronically begins to fire 3X every 2 pulls, 2X every pull, etc...

The other thing discussed is the R/T, this is a device that is not really bounce... it is a pneumatically powered trigger reset.   When you pull the trigger, there is a piston that moves to push the trigger back into pre-fire position.   By finding a "sweet-spot," you can hold your finger at constant pressure and get a fully-automatic type result.

Bounce and ramp are not permitted at tournament events and R/Ts rarely are with the exception of some beginner events.   Usually before every tourney game your marker is checked for velocity (FPS) and for trigger bounce by the refs.   Ramp is harder to discover and unless it is a VERY severe increase in ROF, it is rarely caught.