I see, that makes sense!
Single tagger titan -> probably a singled titan
sink drain adapter -> a PVC fitting that would likely allow quick barrel changes or fairly easy adaptability
darts loaded normally -> all the darts are facing front in a neat line
Sounds like he loaded all three darts into a single long barrel in a line and fired them from a very high power/volume blaster. A singled drainblaster would be similar today.
I'm thinking a tri-barrel setup would work wonders too, if we could somehow link the darts through the barrels. No clue how to do that, though. A stoppered slit would require extreme precision in its construction.
Has there ever been a blaster that had a 'moving cap' between the darts and the pressure chamber, pushing the darts indirectly by pushing the backing surface? Like a t-shirt gun?