I worked a little on the gun that will house these little gems today. Mine should be on Monday. Trying to thread the barrel by hand. Threading it to 3/4 10 NC. Really really hard to turn the die on the barrel. I might have to go to a 3/4 16 to be able to thread this thing. Once I get threaded I am going to make a receiver out of a 3/4" rod coupler. I hope it will hold. The barrel is from an old Marlin 60 with the chamber cut off. The bore was pretty bad so I honed it a little with grinding compound. Haven't slugged it but It doesn't seem to have gotten much bigger. You can still see the microgroove rifling easily. Just want to hurry up and get it done so I can shoot me some nail gun rounds.