Replace your default Silenced Pistol line with this one :

$ PISTOL_SILENCED		INSTANT_HIT	125.0 130.0	347	-1		2	silenced		10	 40		0.40  0.05  0.15  	0  0	1.0  1.0 	 6  18 6	6  18 6  40	7001
$ PISTOL_SILENCED		INSTANT_HIT	100.0  95.0	347	-1		2	silenced		10	 100		0.40  0.05  0.15	1  500	1.25 1.2 	 6  16 6	6  16 6  40	7011
$ PISTOL_SILENCED		INSTANT_HIT	120.0 325.0	347	-1		2	silenced		10	 100		0.40  0.05  0.15	2  999	1.5  1.5 	 6  16 6	6  16 6  40	7031

Enjoy :)