PSO Ver.2 drop rates

[K_I_R_E_E_K]

ok.....
1- i wanted the drop rates, not words (rare, very rare, common.....)
2-some weapons do not have anything (either a word or drop rate)
3-i compared with the drop rates from the other site and they do not match

ultimate
Sil Dragon - Luminous Field (impossible drop, 1/2800) , on the other site is 1/900, either way i have the item
Gillchich - Parts of RoboChao (impossible drop), .....strange, because i have this item
Dubchic - Yasminkov 9000M (impossible drop 1/230000); on the other site it is 1/1000 (+-) 230000 to 1000 is alot, either way i once have found this item.
Sinow Beat - Special Gene Flou, i simply do not know what's the information about this item
vhard
Dragon - Dragon Slayer (rare), since when that sword is rare, it is as common as a star atomizer

ok, in a way it helped me, but many awsers are still a mistery, how does kefka knows the drop rates, i would like to know the drop rates my self.
i still need more information
i did not become depressed, i became confused