Replace your default AK-47 line with this one :

#$ SNIPERRIFLE		INSTANT_HIT	500.0	500.0	358	-1		6	sniper		10	 999	0.7  -0.05  0.2 	0  0	0.75 1.0 	 6 20  7	6 20  7		99	A014
$ SNIPERRIFLE		INSTANT_HIT	500.0	500.0	358	-1		6	sniper		10	 999	0.7  -0.05  0.2 	1  300	1.0  1.0 	 6 20  7	6 20  7		99	A014
#$ SNIPERRIFLE		INSTANT_HIT	500.0	500.0	358	-1		6	sniper		10	 999	0.7  -0.05  0.2 	2  999	1.25 1.0 	 6 20  7	6 20  7		99	A014

Enjoy :)