Not sure if I ever heard of a 2 ml straw, are you sure it wasn't a .25 ml straw -- that is 1/4 cc for us old schoolers. Quite a bit of the imported semen from Australia comes in 1/4 ml, those guns are the same as the normal A-I guns for the 1/2 ml we are used to , but simply hae a smaller diameter chamber.
If you can't find one, I still have 14 of them I used for years transferring embryos. Still use them when I can get the right sheaths in sterile form.
Clarify if you will -- thanks.
Terry