So far I was told "sort of like Tigershark" but never had a chance to look at a Tigershark barrel threads. I have four deluxes and a regular Diablo (with the side pump handles) and no two are completely alike. Good guns though.
I used a Razorback dropout on one but had to put a AutoMag spacer on the powertube to make it fire. I tend to use them like tinkertoys as I have an SC body I made as well. (Back bottle, dropout, DF, SC feed, pistol, Spyder 45 grip, Euro grip, whatever I want to try next).