Increases range of rocket launcher. I have tested it and found a range of 44 (2x vanilla) to be adequate. When set to 50 range, it was too long and sometimes biters did not know what to do when fired upon. When set to 40, it was too short and sometimes biters would aggro before you were in range to fire. At 44, you can fire 2-3 rockets into the nest and run away, performing hit and run attacks. Any less range than that and there's little point to using this weapon.