I remember seeing a Warhammer 40K book in my high school that I’ve forgotten the title of. It was about a space marine (an Ultramarine if I remember correctly) that had been sent back in time a 1000 years trying to get back to his own time. And there were Orks involved, too. If anyone knows the title of this book, I’d be greatly appreciative if you were to comment it. Thanks.
Paperback book. Seen roughly around 2017-2018. Definitely Warhammer 40K. Had the Space Marine on the cover I think holding his weapon, probably an axe.
Malodrax by Ben Counter
Check if that might be it. The story involves a “time gap” - but not necessarily time travel.
Nope. That’s not it.