No, not Hal 4 (bit early for that!)
I've just spotted one of the original Bowman Publishing editions of Hal Spacejock on eBay. There are probably less than 100 of these in the wild, so it's a big surprise to see one.
(This was a short-lived cover. Soon afterwards Hal 1 was released with the original Les Petersen cover, and not long after that Fremantle Press picked the series up and the first book was completely rewritten.)
If you're interested, there's a history of the Hal Spacejock books here
Simon Haynes is the author of the Hal Spacejock and Hal Junior series (Amazon / Smashwords / other formats)