That it is. Part of what I think makes it so effective is using the space between the inner and outer tube as the blast chamber. You get long tube performance in a relatively short package.
Thanks for the link to the toon. I read the whole series and am up-to-date on it now!
Your welcome. The comic is on hiatus right now except for sporadic updates. Noki, the cougar that inspired the character Sandusky, died in April and John needed some time off. Right now he is getting some art put together for an art show in September.
So check up often because he's going to continue to strip. I'm doing my part to get him more readers.