... That according to the Cast entry, Jinx "[l]oves going through Doc's huge collections of old paintball magazines." Which suggests there's a strong likelihood that Jinx isn't necessarily reading the latest issue- he could be reading whichever one happened to be at the top of the stack that day.
Which, sadly, in real life is pretty much a given- there are no paintball magazines being printed in the US anymore. There's one that's kind of a specialty issue, and has taken almost two years to produce four issues- and they're only available by direct request, direct from the publisher, but as for a monthly newsstand mag? Nope, the last one folded back in something like '08 or '09.