#If you don't want to loose your own weapon settings, just replace few lines in weapon.dat with this:
 
SniperRifle    	INSTANT_HIT 300.0  250  1000 1    40  -1.0 -1.0  -1.0   -1.0	0.88 -0.04	0.16	rifle       10 17 14  	10 16 13	99		285 -1 	  28050		8
LaserScope      INSTANT_HIT 300.0  250  750  7    100 -1.0 -1.0  -1.0   -1.0	0.85 -0.06	0.19	rifle       10 17 14  	10 16 13 	25		286 -1 	  28050		8

RocketLauncher 	INSTANT_HIT 300.0 250  1200 1    75  -1.0 -1.0  -1.0  -1.0	0.30 0.0	0.09	rifle       10 17 14  	10 16 13	99		287 -1	  28250		7