i have some test e iran ( i heard is real good) and some primo but both are oil based. won't work with anything smaller than 23g. i'm not used to it, them shits kinda hurt. so i was looking for some good water base of the same thing, that i won't have problems with inj. sites. what do you think are the major differences? thanks rajin, been reading your replies on threads, and definitely appreciate all your advice.