I read in another thread that it is used to remove the BA from an "Oral" solution. for example you fill a dart with whatever compound then draw up some Bact-water shake well set the dart down on the plunger so the bact-water collects at the top, and then expell it. the BA will come out of the solution and be expelled with the water. Make pinning more painless.
Anybody, If I am incorrect in this PLEASE... correct me.