What i was planning to do is to get a smaller tube thats small enough to fit the blow gun and elbow tube's hole and epoxy it to gether, but I don't have any O ring's that will perfectly fit both internal tubes, so yeah i was wondering if plumber's tape will help seal off any air leaks... this is the progress of my guns so far...

you can see a tube connected to the blow gun... it's not glued in just to give you guys an idea what i was doing.. i've pumped it to 10psi and squeeze the blow gun trigger and yes it releases air finely, i charge it up to 15 and obviously the tube couldn't hold on and the tube blew off






