SUN DROP disable

how i can disable dropm for SUN D9 wepons?
i know about rareequip drop...
but this disable all sun
i need only wepons :S
1,2,3=1
4,5,6=2
7,8,9=3
10,11,12=4
13,14,14=5
16,17,18=6
19,20,21=7
22,23,24=8
25,26,27=9

thx