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The most useful/pertinent properties of the eject blueprint component are listed below:
Attached Smoke
If checked, the smoke FX is attached to the ejection port and will move with the weapon.
Attached Shell
If checked, the shell FX is attached to the ejection port and will move with the weapon.
Manual Ejection
If checked, then smoke and shell FX will not be started or stopped automatically. This might be checked for manual bolt action rifles, for example.
Shell Impact Type
This is a key to use in surfacelink look-ups when finding effect types for specific types of surfaces. See GROUND BRANCH Surface Link system.
Min Shell Impact Speed Squared
Shells having a speed greater than the square root of this value will create impact effects on surfaces they hit.