Ah, the masterpiece* known as 2020 Texas Gladiators (a.k.a. 'Anno 2020 - I gladiatori del futuro' in the original Italian)...
Neither of those guys, nor that cool cannon/blunderbuss gun thingy appear in the film, not surprisingly. This is just another example of cool, yet misleading, poster art of the time. :) There is actually nothing in the movie to make you think this was in the future. It looked pretty much like a messed up 1984.
The description is fairly accurate, but the story is so bogged down with "meh" that it's not too clear. *shrug* This is also typical of B-movies, of course. Actually, B is pretty generous. (think C or Z)
They spelled explosive as exsplosive throughtout the fuel refinery scenes. Those pics will show up in my dumberer blog eventually. ;)
As is the case with a lot of old OOP movies, you can see the whole thing at YouTube! (can, but don't have to, of course...)