I found the piece of code in bg_pmove.c file
case WP_RAILGUN:
addTime = 1500;
break;
then i put 10 in the addTime var. I downloaded the openarena souce for linux. When i run the makefile, nothing goes wrong but how can i try the modified code? The built code is in openarena/source/ioq3-svn982/build/release-linux-i386 and i have hardlinked the baseoa dir from myhome/.openarena but i can see no modifications.