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This property defines the fire rate of a weapon in rounds per second. The higher the value the faster. A value of 1 means it fires one round per second. One way to find the value needed, especially for slower rates, is to divide 1 by the number of seconds between rounds.
If this property is set to longer than 15 seconds between rounds (~0.067), the weapon loading will freeze at 15 seconds until Fire or AltFire is pressed, continuing to freeze every 15 seconds until the loading is complete.